Yann's apartment is a very cosy and comfortable room with everything needed for an enjoyable stay. It is a small space but a perfect size for two people. The apartment has an attached bathroom and also a kitchen which is nice for cooking inside instead of eating out. The location is quite nice and extremely close to several transport options including buses and the metro.
Guests should be mindful of the 6 flights of stairs which have been mentioned by others, but I had very heavy luggage and we managed okay.
Yann is a very friendly host who was very accommodating and quick to respond. We had some last minute changes to our plans on check in day and he allowed us to leave our bags at his store early so we could manage it before check in time. He was also very considerate on our check out day as well by letting us check out late.
I would definitely stay in Yann's apartment again!