I can highly recommend Yves ans his apartement and I can confirm all the positive things that have been written before!
Yves is the perfect host, communication (including check-in process) was very good and easy. As I travelled on my own I was glad to know that Yves lived in the same building. An Yves is a Parisian, born and bred.
As for the mattress I do not understand the recent complaint. I found it absolutely perfect, not too hard and not too soft either.
A general tip if you have prebooking for Museums: get there early (at least 15 Min. before your booked time) as Covid and Security Checks might take quite some time.
Yves and his apartement are great in every respect and I hope to be back soon.