Sophie place has an amazing location, just 2 blocks away from the Sacre-Coeur, and from typical touristic points in Monmartre. The apartment is small identically as shown in the pictures, but have everything you need for a comfortable stay. We didn't met Shopie, but Franck was really kind and he checked all time that we had everything to feel comfortable.
We were 2 adults and a 3 years old. But 4 people wouldn't be an issue as well.
I recommend this place at all!