Its location is great: close to the entrance and the smithery. And you have two entrances, great!
It's so cosy with all the wood.
It has relatively enough storage room.
I love Hjerim in Windhelm

I like Proudspire manor in Solitude because it's huge and has a lot of storage room, it's fairly close to the Blue Palace. There are plenty of bookshelves, which is nice.
I like Vlindrel Hall in Markarth because it has the most storage room. It's location is a little bit less interesting. I think it's especially great for a dark character who enters the Thieves Guilt and the Dark Brotherhood. There's a lot of room for books there.
I like Breezehome in Whiterun as it was my first home so it's nostalgic. I really like the fact that it's close to the entrance and the smithery and that there actually is a chest in the alchemy room to put all your ingredients in. I wonder why they haven't thought of that when creating the other houses.
What's your favourite Skyrim house and why?