Personally, as a dovah myself, haha, I would pick either Dragontooth Crater or Skyborn Altar. My reasons?
Dragontooth Crater: I feel as though its one of the few lairs that isn't covered in snow and isnt cold. Id prefer cold over extreme heat, but I wouldn't want to live there. Plus, its not a very high lair either, and has a large rock face blocking out sunlight. Its not a central location, and traveling to a place like Riften would be exhausting, but every place has some bad to it.
Skyborn Altar: I feel this and Shearpoint have sort of a central like location in Skyrim. They're not exactly center, Skyrim Altar beong close to Morthal, but its close enough center. The name is also cool as well. "Altar" sounds like a place people would go to worship and pray to. Ergo, me! Haha. It may be cold, and I don't like the cold, but it has its perks to it, if you don't mind the cold at least. I prefer cold over heat anyday though.