We were very happy staying at Sebastian's place. We found the space quite comfortable for 4 people (2 were a couple sharing the main bedroom) and 2 stayed in the sofa beds. Check in and check out were super easy thanks to the use of a quite modern keypad. We didn't get to meet Sebastian in person but it was very easy to communicate with him through the app. The best part of the apartment was the location, in the heart of a busy street with easy access to many good bars, restaurants and public transportation. I personally recommend a polish restaurant within a walking distance from the apartment. Would be happy to return.