We spend 2 nights in Sebastian's apartment.
The flat is ok, located on the third floor (attention for those who has much luggage). It is equiped with many things you might need, especially the kitchen.
We haven't seen or heard Sebastian and got the key from the security box. Anyway the communication was easy through messengers.
The view is wonderful through the floor to ceiling windows over all the buildings (due to the third floor), the location is somewhere far from everything - quiet and peaceful.
However, it was rather cold in the flat in the evening and we had no heater. There are still some holes in the window frames. The internet connection was a bit slow and interrupting some times. The flat itself has some corners, which look like being renovated or need to be renovated.
All in all ok for the price.