Very convenient location. We chose here because it's close to Montparnasse station and we wanted to take a early train from there. It was also close to some other metro stations, and it helped us because it rained everyday during our visit. There were also some grocery shops and pharmacies near there and we appreciated it because we caught a cold and needed some medicines and water, fruits, etc.
This is a hotel, not a typical airbnb. I was a kind of unaware of it, so a bit surprised when I saw our room was located underground, not like their image pic. But it's normal because this is a hotel.
There is free breakfast service and it was super nice. As far as we researched, other hotels' breakfast service were pricey, so it's great.
It was unique experience to stay a hotel through airbnb, but we totally enjoyed and appreciate it.