Rob's place is perfect for a solo traveler or a couple. I really liked the simplicity of the apartment. I also enjoyed doing yoga here. It has plenty of space for a mat and lots of light which is always a big plus. All the amenities are there and Rob is super quick in getting back to you. I left my tripod in the apartment after checking out and Rob was very quick to get back to me when I messaged him asking to coordinate with a friend for pick up. The apartment is super quiet as it overlooks into the garden. It is also in perfect location, U-Bahn, S-Bahn is a few minutes away and there are also buses and M-trams. I had meetings all over the city, and the maximum it took me to get to them was 30 - 40 min. Next to the apartment, you have a mall where you can also find a supermarket and the organic food store is just 5 minutes walking distance.
I would certainly consider reaching out to Rob next time I am in Berlin and stay in his apartment.