My time at Myriam's was great! However, I did not spend much time at the apartment, as I was usually out in Paris...
That being said, Myriam was pleasant to talk to and very welcoming when I was in the apartment!
The location is also great, as many of the city's monuments and museums are, at most, a one hour walk from the location. Many are within 30 minutes!
Overall, I would recommend!