Simon was great as a host, very friendly, helpful and hospitable.
The studio is really nice and clean, and has everything you need.
It is in a great area (although it helps to have some pre-knowledge, about the best spots - we had previously stayed i this neighbourhood and know it very well), extremely well located for travel, and sightseeing.
All around, a very pleasurable experience, and I would definitely recommend Simon and his flat to anyone visiting Paris.