The apartment is in an old building in Prenzlauer Berg, which makes the place unique and special. The decoration is exquisite!
It's a 4th floor with no elevator, keep this in mind if you're carrying large luggage or a baby stroller. The mattress was too soft for me, some people will love it, but in my case it's really uncomfortable for my back. And last but not least, if you're visiting Berlin in spring or summer and find it difficult to sleep with light, bring a sleeping mask with you since the blinds are not very covering.
The apartment is very close to local transport and you can get really quick to almost every place. Very convenient for the Tegel airport.