Marc was great. He went over everything in the flat and answered my various questions about Berlin. The flat is very quiet and is on the ground floor -- no stairs at all and is very well stocked with everything I needed for a one week stay. The neighborhood has many shops and restaurants and the flat itself is only one block away from 2 major U-bahn stops and an S-bahn stop, so it was easy to find my way around the city. I would definitely recommend Marc's flat.