Cecilia's apartment is very comfortable and well located, you can get to alexanderz platz or brandenburg tor using a bus or tram (you will find the stops very close to the apartment.) The kitchen has everything you need to cook and the beds are very comfy. The neighbourhood is beautiful, super quiet and safe. Also, one of the owners speaks Spanish!
Unfortunately, we couldn't use the washing machine because it was broken, but Cecilia did everything in her power to fix it before we had to leave.
All in all, we recommend the apartment and Cecilia, too.