We really enjoyed our stay at David's place! It is perfectly located on a pedestrian street, with grocery stores nearby, and in close proximity to the metro. The apartment is exactly as described by David and the other reviewers -- we had no surprises when we got there, though we were delighted to find that it really was as charming as promised. The stairs are as-advertised and not to be underestimated but not a major hassle. The space is small but marvelously organized so that it feels much bigger -- it has everything you'd need or expect!
Smoking is allowed in the apartment, and as non-smokers we were slightly worried before arrival, but the place is clean and does not smell of smoke. We did find that it felt a bit musty and humid if we both showered in the morning without opening a window for fresh air. Overall, though, David has thought of everything and the apartment is well-appointed. It had everything we needed, and nothing that we didn't!
David was phenomenal to work with. He was communicative before our arrival and helpful in answering questions. David and I spoke in French but he had no problem communicating in English with my fiance. We arrived on Christmas Eve, and he checked in advance for us to make sure stores would be open so that we could get basic provisions on arrival. We arrived early, and he still greeted us and helped with our bags (we then went to grab lunch while he finished cleaning). He also got us a bottle of wine and helped us with the wifi password before leaving. He is incredibly thoughtful, and his place is spotless and well cared-for. Another occupant of the building was having work done the week we were there, and he communicated well with us about the work and the effects it might have on our stay, even though, as it happens, we were totally unaffected.
This place was perfect for our stay and I can't recommend it highly enough!