We only spent one night at Christina's place as we needed a place to stay before flying out via Tegel. The place is located in a quiet residential neighborhood but just a 5 minute walk from the nearest S-Bahn and bus stops. Getting the key and finding our way around inside the apartment was very straightforward and the apartment itself is definitely one of the nicest Airb'nbs I've ever stayed in, clean, cozy, and full of thoughtful touches that and amenities a traveler might need (e.g. toothbrushes, snacks, and a bottle of water by the table). I was truly impressed and highly recommend this place.