Very nice, with unique layouts (the huge shower behind the bed in one bedroom is particularly interesting!) and plenty of space for our group of ten. The host was very responsive and communicative. There was a great patisserie next door and it was easy to walk to the Eiffel Tower or public transportation.
One thing that isn't obvious in the listing is that there are only two toilets, though. We got by but that is a concern for a large group. All the bathrooms connected to bedrooms are just baths or showers.