We never met Stephane, but he was always available by email and responded promptly. He sent a taxi to the airport for us and was understanding when our flight was delayed.
The apartment is great and very well located. It's about five minutes on foot to the Charles Bridge, which puts you close enough to be in the center of things, but far enough to avoid the huge, loud crowds of Prague.
I would stay at this location again for both its convenience to the Old Town and Stephane's great service.