Gregoire was the perfect host. I was delayed by a problem on Eurostar, and could not contact him once I was in France because Eurostar has no WiFi. He rearranged his evening to be sure to meet me - how kind!
The location is right in the Quarter Latin, just right for many tourist spots. Gregoire's recommendations were very useful, and he took the trouble of confirming opening times.
On the down side, the bathroom drain leaks a little, but you don't come to Paris to admire the plumbing. And there was a bit of a smell of tobacco, which might bother someone who was extremely sensitive.
Overall, I really enjoyed my stay with Gregoire and only wish it could have been longer.
Thanks!