It's been said by other reviewers, but the location cannot be beaten. We were a family of 3 and yes, the apartment is small, but this is Paris and all accommodation is tiny! That said, it had everything we needed, we slept well and the apartment is extremely quiet and safe.
Use the local food shops - they really are excellent and just walk! We have had a ball here and cannot wait to come back.
Check in and out were very straightforward and smooth.