Gilles's apartment was perfect for our stay in Paris. The location in the Marais, is near the Louvre and Notre Dame. There is lots of shopping nearby and excellent restaurants.
The apartment is on the 4th Floor (5th floor for Americans), there is an elevator but it is small. The apartment is beautiful. The bed was comfortable. The street is mostly quiet, you are in the middle of Paris so don't expect it to be perfectly quiet.
We never turned on the TV, we were in Paris. The internet worked well. We did not use the Kitchen, we were in Paris for along weekend. Who wants to cook with Paris outside the door! The bathroom is modern and sleek. The shower is small but nice. I also used the washing machine for some sweaty running clothes and that was really nice. The cycle Gilles recommends in his book washes and then dries.
I would stay here again.