If you want nightlife, this is the place for you!! Robert's place is SO centrally located - you can walk to the Berlin wall and museum in just a couple of minutes, and all of the clubs are in the area. The trains are close by and it's easy to get to other central areas like Alexanderplatz.
Robert is very friendly and helpful, and is happy to go above and beyond as a host. I especially appreciated his providing personal recommendations based on his experiences so I can avoid the tourist traps. If you want a place to stay and a guide all in one, look no further.
The only drawback is that sometimes the area is lively/loud at night, which comes with the territory of being in such a convenient neighborhood for nightlife. If you are a light sleeper I recommend bringing earplugs or headphones. Otherwise, enjoy your stay!