We (2 elderly, 2 adults and 2 teenage boys) stayed at Bensimon Apartment (ground floor) in Nov/Dec 2017 (4days).
Hosts - Ben and Simon are wonderful, thoughtful and very swift in responses (even during wee hours. Shared tips on how to moved around Berlin.
Apartment - More spacious than what were shown in pics. The bathroom was HUGE and NICE. Shower pressure was excellent. Very well-equipped kitchen with dishwasher, toaster, pots, lots of utensils. 3 bedrooms were all equipped with heater, comfy and clean beds. Equipped with facility to do Chromecast. WiFi was cranky and Simon was very quick in responding and provided a alternative to us. Thereafter, the WiFi was good.
Location - Apartment is in the inner yard of a building. Secured and quiet. Near to S bahn (about 200m from apartment). There is a bakery nearby, 150m from apartment, along the way to S bahn. The supermarket (REWE) is about 800m away and took me 15-20mins on foot (can take bus which will be about 2 stops).
We like the apartment very much and enjoyed our stay. On the 1st day, Ben was there to bring us round the house, giving us tips on places and travelling, and taught us how to use some of the appliances. Will definitely stay here if we are in Berlin. Highly recommended.