It's a great choice for staying in Berlin. A block away you have a supermarket, and the metro and tram station that will take you anywhere you want to go in the city (there is one tram that will take you to Alexander Platz in 15 minutes).
The apartment is very clean and comfortable and has everything you may need.
There is a reception desk open from 8am to 8pm and the receptionist is very kind and helpful.
At the ground floor there's also a drink vendor and coffee machine.
We enjoyed our stay very much and strongly recommend this apt!