The apartment is a small studio in the top floor of a 19th century building in the very heart of Paris (literally between metro stations Rue du Bac and Solferino, 1-2 minutes walk to either one of them). It's overlooking the roofs of the inner yard and thus is very quiet. A narrow winding stair leads to it and there's no elevator, so you'll have nicely toned legs from walking up the stairs every day.
The studio has been recently remodeled and is very modern. It has a fully fitted kitchen with an electric stove, a microwave, an electric kettle, a mini fridge and a sink, all utensils and dishes are provided. There's a TV and wifi. A convertible couch serves as a very comfortable double bed; when it's in the bed mode there's barely any place left to walk though. The shower is really nice: modern, clean and spacious. Towels are provided. The bathroom is separated from the main room by a clear glass door, which is good to know in case you're not ready to be seen on the toilet by your travel companion.
Overall, the apartment is very nice, neat and clean. And despite its modest size, it has everything that can possibly be needed. It's perfect if you're traveling for business or if you're a tourist who's planning to do sightseeing every day.
We loved our stay at this apartment and would definitely want to stay there again if it's available during our next trip.