This is a nice flat in Paris, in Rebublique- which is pretty center. Quentin is a great person/host who tries his best to accommodate.
It is on the 4th floor but even if you have heavy luggage, this building has elevator, which is a plus.
Few things to keep in mind- when i stayed there, I found the bed is comfortable, you sleep like a baby after spending hours sightseeing. But the place is not super clean most probably due to the constant influx of people coming in and out and Quentin being busy with work. There's one shower and one separate toilet to share with others.
If you're a young couple, wanting some peace and quiet and romantic times together, this might not be the best , but to crash after sightseeing this will work, especially for the price.