We had a very pleasant stay at Studioprestige. Everything met our expectations. We were 5 presons and the apartment was large enough to provide comfort and privacy for everyone. I wouldn't recommend it if you plan to stay most of the day in the apartment, but for those who search for nice place to stay for the nights, get up in the morning and travel in Paris - it's perfect (that's exactly what we did, and we were very satisfied with our choice).
The host is very nice and was very responsive to every question, before, during and after our stay.