We had a great stay at Maison Sophie.
For us the best thing was the location as it was so close to the metro; had plenty of shops nearby; and allowed us to visit St Peters and the Vatican museums easily, early in the mornings
We loved the quaintness and charm of the building, particularly pushing open the huge door from the street into the little inner garden and hearing the bells from the adjoining church.
My boys made full use of the Netflix and loved that they were able to watch different things in the different bedrooms.
We slept very well, however, I can imagine that the beds would be soft for some and traffic noise a problem for others (we did not have an issue with either of these things). The only other thing that could be an issue is that one bedroom is impossible to have completely dark at night as the light from the communal hall way comes into this space, but again for us this was not an issue as my children like to have a nightlight so they slept in this room and it suited us very well.
I would happily stay at Maison Sophie again!