Carsta is a kind person that every time had responded quickly.
The flat is well located, close to the centre/Alexander Platz that you can reach by tram in 5 minutes or by walk in 15 minutes. In the night you don't have the tram that leave you in front of he building but you have the u-bahn that have a stop at 10 minutes by walk from the house.
The flat is good and the room is big and confortable, the only one problem, for me, is that the room don't have shutter but only white curtain that allow the light to enter inside the room in the morning and if there is a good day the room is very shiny. I suggest to the guests to provide an eye mask if the light can disturb the sleep.
In the flat live the son of Carsta that is a polite and quiete guy that never can annoy the guests.
I recommend Carsta and his room to everyone, ut was a good experience!