We spent two nights at Olivier and Matt's, who are very friendly and helpful. The apartment is clean, nicely decorated and very well placed in Paris. There are lots of nice restaurants and bars in the area. Also, the main sightseeing places are in walking distance.
If you can come with public transportation - it's perhaps more convenient as the parking costs are very high in Paris centre.
Anyhow, we were very happy about our stay in Paris and at Oly and Matt. They helped us with a lot of information and gave us a good advise.