Nadar is a great host.
He welcomed us in the apt and was always available for questions.
I would rate the apt as good.
When we stayed at the apt there was a strange odor i(mainly in the living room), it was likely from the cleaning material, but it was unpleasant.
We had an issue with the hot water, where after roughly 8 min of shower there was no hot water. Maybe for 2 people it's enough but for 3 it wasn't.
We stayed there with our daughter and we needed to use the extra bed (sofa) which was very uncomfortable. The main bed was comfortable.
The entrance to the building is not very welcoming, but the location is great and really in the center of everything.