Frank is a super nice guy who runs "the small hotel in Berlin," actually a two room pension in a cool part of the city. Very easy to get to, literally around the corner from the Schoenleinstrasse UBahn station. Loads of places around to something to eat or drink, short walk to where the Turkish Market takes place twice a week, one stop on the UBahn to Kottbusser Tor near the heart of Kreuzberg (also walkable). Highly recommended!