This location is amazing... just a few minutes' walk to Metro stations and LOTS of wonderful places to eat dinner and have drinks.
Two things I would say, however:
1- if you have 6 people staying here, prepare to be on top of each other. We were 4 adults and it was cramped but ok. Maybe 2 adults and 4 kids might be ok, but I cannot imagine how 6 adults would manage this. The photo of the kitchen/dining room shows the table folded up. Open up the table and it's about 5 feet to the sofa.
2- it is more than 10 steps up to the door. It's closer to 20. And they're steep. And dark at night if you don't know where the light switch is (we didn't until we saw a resident use it!).
We would definitely stay here again if we wanted to be in the 6th arrondissement. It's not far from anything!