The location of Christophe's place could not be any better. It is located in the heart of it all, and the metro is a quick 4 minute walk from his place which makes getting to and from the airport, or around the city incredibly easy.
Christophe is an outstanding communicator, and I felt very prepared going into my stay, along with what to expect upon arriving as well as checking out. He provided excellent navigation advice in a timely matter in terms of how to navigate the metro, as well as getting to the airport.
Upon arrival to his place, there was a very detailed handbook that provided all the information about the apartment - how to work lights, keys, espresso machine, bathroom appliances, etc. He also provided a delicious bottle of wine which was such a thoughtful touch.
The space was professionally clean, and the apartment appears to have been recently updated - counter tops, bathroom sink, shower, etc. The space was smaller than I had expected, but that is typical for a European studio and 98% of each day I was out exploring the city.
It is located on the 5th floor so if you are constantly going up and down the stairs you will get a workout in, BUT, there is an elevator so take your pick :-)
Overall, Christophe was beyond helpful, knowledgable and has a great place. I would no doubt stay here again next time I visit Paris.