We loved our stay at Yohann's flat! The decorations were cute and each room was a decent size with comfortable beds, sufficient closet space and were very clean. It was very nice to have two showers (there were 7 people in our party) and two toilets! That was a HUGE factor for me in selecting this flat for a party of 7 because many of the other flats I looked at only had one shower and toilet.
The flat was very secure and was equipped with a washer and dryer which came in very handy (although, make note that the washer and dryer was not like American washer/dryers and went at a much slower pace - should not be a problem as long as you prepare for that that ahead of time). It was also very nice to make coffee each morning - there were two coffee machines and they supplied us with coffee pods!
The wifi was also great - the speed and internet service was good. Most of us had Verizon.
There was a metro station just around the corner and a super market very close by where we stocked up on breakfast food, water, toilet paper and other necessities.
One last note - there are "ladies of the evening" that stand out on the street all day but they are very quiet and peaceful (hence, the name of the street). They did not disturb us or approach us and we did not disturb or approach them. It was not a problem at all for us as everyone in our party were adults, but it could be uncomfortable for families with young kids as some of them wore very revealing clothing. Just be respectful and don't harass or take pictures of them and you should not have a problem. However, a note to female travelers: be mindful not to loiter on the street if possible so that no men who are interacting with the "ladies" mistake you for one.
I would recommend Yohann's flat for anyone, especially with a bigger party, who wants a comfortable easy stay with access to quality amenities and thoughtful hosts.