I stayed here three nights with my wife. The apartment was clean and very conveniently located: the Louvre, Notre Dame etc. were all within a walking distance. We never actually got to meet Daniel but were welcomed by his friend Frederic. Both were very nice people. We were overall very happy but I'll mention two things that might bother someone (even if they didn't bother us):

-Despite the central location, the apartment was still relatively quiet as it was located in an inner courtyard. However, there was some noise during the night from (apparently) people going to their apartments. This didn't bother us at all but if you are a very light sleeper, this might be a problem.

- I should also say that the steps to the apartment were very uneven. We are young healthy people, so this wasn't an issue, but if you e.g. have problems with your balance or legs, you will want to be careful.