Rainer's apartment was a great find on airbnb and I'm very glad that myself and my partner found it. The host was very upfront about the stairs which we appreciated and in the end found them a great leg workout over our week's stay. Being a penthouse studio, the water pressure dropped for 2 days over the weekend which resulting in a couple of cold showers but Rainer was reasonably quick in fixing this problem with building maintenance for us. We loved having our breakfast in the morning with the blinds fully open as the windows let in so much natural light. 5-10 minute walk to the Hermannstrasse station (which has both S-bahn and U-bahn connections) made it super easy as it only took 1 S-bahn trip to get to and from the airport, ideal! Whilst the area is a little out the way from most of the main tourist attractions, Neukölln seems like a very up and coming area in and of itself. Schiller burger and From Hanoi with Love were two local places we would absolutely recommend going for dinner! Short walk also to Tempelhofer Feld which was a great morning of cycling. All in all, a great hub for exploring such a fantastic city!