We highly recommend staying at John's beautiful place - especially if you love interior design as much as we do (and he obviously does). The location is really close to the S- and U-Bahn, making is very easy to reach the best districts and sights of Berlin.
The place itself is full of natural light and really cosy, albeit you should not expect a perfectly quiet environment in Neukölln. Nevertheless, we had great nights of sleep in the place.
Communication with John was always quick and reliable, we were super satisfied with him as a host.
Thanks for sharing your place - we would come back anytime.