Three of us (all adults) stayed in the apartment for three weeks.
Things were a bit cramped for three, especially the kitchen, but it was warm and comfortable (winter) with plenty of room in the lounge even though one person needed to sleep on the bed-sitter.
Located on the third floor, there is a lift available but the stairs make for a useful adjunct to any fitness programme :)
Noelle greeted us warmly upon arrival and helped us to settle-in with useful information. Also, communicating with Noelle prior to our stay was very easy and helpful.
The apartment is situated in a lovely part of the Marais district with easy access to buses and trains; one bus stop is just around the corner and access from Gare Montparnasse is a single, direct bus ride - couldn't be easier.
Many of the popular tourist locations are within comfortable walking distance. Picasso Museum is 8mins away, supermarkets are only a 10min walk. Add a boulangerie 30metres away and an excellent wine shop 60metres away, what more can one say ...
For us, the over-riding factor was location and we had a great time!