The flat is really nice and well located, Younes has been very kind. But we had a problem: we were 4 and we paid a (significant) extra fee for 2 people more than the 2 standard ones. The issue was that the 4th bed is a sofa. Not a sofa bed, just a leather sofa. Luckily we found another solution, but my suggestion is to be maximum 3 people, unless you agree to sleep on it.
Nonetheless, I suggest Younes's apartment, because it's cosy and it has lot of facilities in the neighborhood - even if it's on the 4th floor with no elevator.