I had a negative experience in Guillaume's place, but I don't think that should necessary discourage other guests from staying there, depending on what you are looking for. The positives: Guillaume is very responsive and quick, the location is great, and the apartment is spacious. The negatives: the wifi is slow and unreliable (it went out two days into my stay), the apartment is on the sixth floor of a building with no elevator, there is no AC or (when I checked in, though this later was addressed) fans, and the apartment retains heat and humidity. I happened to be in Paris during one of the hottest weeks of the year, so the apartment was not at all comfortable. I also had lots of work to do during my stay, and the internet issues meant I had to pay to go use coworking spaces, even just to check e-mail. I ended up leaving early and staying in a hotel. If you are a business traveler or are traveling in the summer, I would not recommend staying here. If you are traveling for pleasure or are coming to Paris in another season, I imagine that the place would actually be nice and you could enjoy the trip. And I do want to reemphasize that Guillaume was very quick to respond and did his best to help out, such as by bringing a fan over; unfortunately for my trip, it wasn't enough to make my stay an enjoyable one.