This is the mod I use for my housing. I dont quite use this castle to store my items and such, that'll be explained shortly, but I love it and everything the creator has put in it.
The castle comes with its own world cell which can be accessed through a gate I believe south of Falkreath. Once through the gate you just have follow the path and be warned you will get lost if you wander off the path, especially during the night. Once you reach the castle you'll be presented by all sorts of interesting things. Lots of guards to feel as though the castle is perfectly protected which is a nice vibe in my opinion, the castle appears to take inspiration to Castle Volkihar in the Dawnguard DLC what with gargoyles decorated all over the place, the interior designs and much more. The mod also comes in with more unique models for furniture, paintings, and other static materials from globes, fancy beds and other things which I find them quite good but that's a problem which I will go into soon. There are over a dozen rooms in this castle, from a Ball Room, Dining Hall, War Room, Alchemy Tower, Gardens, Barracks, Library, Trophy Hall, it goes on and on and there are secret rooms in the castle as well, and so far I've found only two. One being the Forbidden Tower which consists of a shrine to Molag Bal and portals to either the Dark Brotherhood Sanctuary or to the Soul Cairn, and the other being the Forbidden Library which is a dark lit room with cursed evil books as well as objects from Apocrypha of the Dragonborn DLC.
And though this mod is great, I do have problems with it though. For example, it doesnt quite have that much of a functionality to be a home, much less any use at all instead of being a big stage for screenshots and what not. There's little to no chests for you to use and organize your belongings, and at times you can be lost in the castle just to find one room but I guess that's nickpicking seeing how massive the castle is. There are also certain NCP's in the castle as well, some appear to have a somewhat purpose to the castle such as the Servants but they do nothing, you cant even talk to them and tell them what you want. The Nobles I guess are used to make the castle less empty but the moment I got to the castle I just went around disabling every Noble NCP I can find until they're all gone or atleast leave some just to keep that low emptiness feeling. The named NCP's however arent that bad, even though they dont do anything it's still nice to have them in the castle and feel like a true Lord or King or Ruler of the castle as they are your loyal subjects. Now all I'm missing is a Jester in the Throne Room and I'll be good. And now we get to the chest issue, apparently there is such a thing as having too much static objects because though some of these objects like dressers, chests, drawers, and all that look pretty and fancy, they're only there just for decor. You cant interact with them, you cant put any clothes or items in them, they're nothing more than just something fancy to be in there.
One more thing, even though this castle has alot of things in it, and it just got an update, I still think that this mod is a Work in Progress for there are certain rooms that completely empty such as the Kitchens and I believe the Advisers Tower? There are certain places that leads to absolutely nowhere, and certain objects like a lever that leads to the Treasure room is missing or is too difficult to find. Other than those issues, I say this mod by its current condition, is best used mostly as a stage for your screenshots and what not, and I can truly see how much time and effort was put into this mod and I can see that this mod has great potential and many people hope that it can be just as good as another big castle mod named Sjel Blad Castle where in its entirety is a fully customizable castle from the armor your guards wear, the banners, your throne, what are your guards, and comes with some unique stuff such as being able to summon the named dragons including Alduin himself to aid you in battle like a conjuration spell, as well as having other unique functions and the ability to build up your castle by paying people to work for you.
So if given the chance to add a few things into this mod, I have something in mind. Like make the entirety of Castle Raven into this money quest to which you need to fund the reconstruction of the castle, hire guards and workers to aid you and your castle, persuade nobles and the like to fund you and your endeavors to make your castle better, discover lost secrets in and around your castle territory. I even have an idea for the certain paintings in the castle's throne room. Since I believe that this mod is most suited for Vampires, what if the previous owners were vampires and that we had to go and kill them in scattered areas around the land of Skyrim to find them and get a unique item or a set. The paintings looks really interesting and in most of the paintings I wanted what they were wearing, especially their crowns. Because to me, in the condition the mod is, I dont really feel like a ruler, I feel more like an adventurer who just stumbled in and explored through it all like a squatter. I would also add in a few more things to keep the mod interesting, mostly taken by the Sjel Blad Castle. Have the ruler be able to conjure named dragons like Alduin by offering a ton of dragon souls to receive the spell, collect pelts, ingredients and other items to build stuffed monuments, have the guards be customizable, there is so much opportunity this mod have. But I dont know anything about creating mods, and I'm sure it takes a long time just to build one. So for now, this castle is okay by me. I'll just keep waiting until the castle has more functionality for me to actually live there and feel more like a ruler and less like a worthless squatter.