This is a small Playerhome near the Whiterun Stables.

No Map Marker because it is Rigth next to the Stabels and i think it would be senseless.

The Key is atm on one of the beams on the Walkway (Look Screenshot)

Requirements : Dawnguard.

If you want that your Followers live there use
My Home is Your Home by Allie1718 uploaded by FakeTails

Texture Mods that you see in the Screenshots (No Requirement) :

Static Mesh Improvement Mod -SMIM by Brumberk
SSE Texture Pack - Osmodius by Osmodius