If you are looking for a guestroom close to centrum, that feels like a hotel room, with small features like there are soup, deodorant, and other stuff, that you can use if you haven't brought anything your self.
An overall clean and well-tought apartment. With plenty of privacy, but at the same time, some really nice host the have a beer with and get some good tips about Berlin.
This is the one to go for!
I can really recommend it.