We have had a great stay in these wonderful city apartment. It has big space for 4 or 5 persons and is directly in the city center. It is clean, free wifi and full equipped kitchen and bath room. All what you need...
The metro is just 100 meter by walk and it needs just 8 minutes to Alexanderplatz. The owner is very polite and the reservation is very easy.
I can really recommend this apartment.