This place is cute, tastefully decorated, and has everything you need for your stay in the heart of Paris. Fantastic location, close to public transport. Heating worked well. Great for couples, not great for people that bring a lot of stuff. Only one bathroom and toilet (not 1.5 bathrooms).
The apartment overall:
The place is adorable but not huge. Great for couples, could be a little tight for three people. There is not a lot of room to lay out suitcases, in case you're coming with a lot of luggage, which we did not.
The kitchen:
We cooked one or two nights, which was perfect. The kitchen is well equipped. If you plan on cooking a lot, consider looking for a place which a larger kitchen to have more operating space. It worked well for us though.
The bathroom:
Not a problem for us, just an FYI: I do note that this is not a 1.5 bathroom apartment as listed (which would imply that there is a full and a half bathroom, aka two toilets). The bathroom has a shower, a sink (and a very nice towel warmer), but no door. One can see your fellow travelers stepping in and out of the shower from the bed. The toilet can be separated by a sliding door.
The building:
Also just an FYI for people that travel with a lot of stuff: You need the elevator to access the apartment. The main staircase (which is wider) does not go all the way to the 6th floor (at least not that we found), and the alternative staircase (which goes all the way up) is very narrow and not ideal for carrying up suitcases to say the least). The elevator is custom-built for the building, adorable, and tiny (tight for 2 people w/o suitcases). The max capacity is 150 kg (330 pounds).
The host:
Friendly, and flexible with the arrival time.