Ghislain helped us with the whole check in and check out process - he was great! Erwan sent out an awesome guide prior to the trip on where to explore as well
The best thing about this place is the cleanliness - everything was spotless.
Be prepared as it is a pretty tight space - couch turns into a pull out bed. That would be the only suggestion I have in terms of upgrading is the mattress. but as far as size goes, I'm assuming it's what you would expect in the middle of Paris :)
The metro was about a 5 minute walk from the apt, about 30 minutes to main attractions, restaurants and bars right outside your door. all in all, a nice place to stay