This apartment was exactly as advertised --- well decorated and super clean. It is located in a nice & quiet neighborhood. There was little to no street noise. It is 5-minute walk to metro station and 10-min walk to Rue Mouffetard. Carrefour supermarket is just across the main street after 2-minute walk. There are a number of great restaurants, cafes, and bakeries in the neighborhood. Les Négociants is one of the restaurants we liked during our stay.
In a way, the apartment is like two hotel rooms (one upper and one lower floor) plus a kitchenette. The kitchen is small, but well equipped, including a washing machine. Note that laundry detergent was no provided by the host and we had to get it from the supermarket which is quite close.
This apartment is not your choice if you like open window and good air circulation! The lower floor is essentially in the basement. The only way to make air circulate is by running an old & loud fan, which doesn't really do much. The window on the upper floor is opaque and can only open a slit as the other side is the street. As the result, even by running the fan and opening the window by the slit, the air is still hot, stale and a bit musty. This is not bad compared to hotel rooms though. But combined with the next reason, one shall take it into consideration when planning a trip during summer.
The AC was insufficient. It was already mid August during our stay and the outside temperature was not too high. But running AC for 5 hours only cooled the upper floor for a few degrees, still around 25 C. The basement was even hotter because of no air circulation. There were a couple nights we had trouble going to sleep because of the heat.
I realize I devoted the last two paragraphs to the drawbacks of this apartment. But overall, we still liked this apartment and did not regret making this choice. Cleanliness and comfort are definitely a big plus. Quiet neighborhood is also a plus. The lack of open window was expected before the trip. There is a small drawback with the lack of air circulation, but it wasn't bad. We will be happy to book this apartment again next time we visit Paris.