We have spent 2 nights in the flat and we had a great time! Location is great, just 3 blocks away from Canal St Martin and 2 blocks from a nice party street Oberkampf with great restaurants and bars. Metro Goncourt (2 min) and République (5 min) are both very close so it's perfect to move anywhere in Paris.
Apartment size is ok for Paris, there's a small lift but very handy for the bags or backpacks and great daylight all day long! Good address and the host is very flexible and we had a great communication at all time. We highly recommend this flat! :)