We had an overall nice experience staying with Yann who was kind and responsive when we had questions and requests.
We booked it for 4 People and I would say it is too small,
It is better for 2. You will have to order food most likely as the place is too small to do basic cooking.
As posted in the description, walls are thin and it can be difficult for people who are looking for intimacy and quiet.
Yann's apartment is located close to a subway station and a bus stop that connect you to the city center in at about 15/20mn.
I recommend an apartment more central if you are not looking forward to the commute.