Sparkling clean, quiet, and very cozy. I felt at home right away.
The building is very calm, with an elevator. The apartment has two private balconies and is actually bigger than it looks in the pictures.
Pretty central. I walked to the old town in 15 minutes. Don't miss Sofia church and its nice hilly park, just a block away. The neighborhood is great to explore too, with a lot of stores, coffee shops, restaurants, etc.
I recommend and I will definitely stay again if I'm back in Stockholm.