The flat was very nice and exactly what we anticipated. It is located in a quiet neighborhood with many quaint bars and Turkish restaurants. The nearest U-Bahn station was Kottbusser Tor, which has a mix of normal and shady beggars. Be sure to click through all of the check-in steps to know exactly where the entry is. It is above a restaurant and near a shop, so we did hear significant noise both morning and night.
Overall, it was perfect for us, as we spent most days sightseeing and came back to freshen up before going out to local taprooms.