Very large apartment (for Paris standards), 15 minutes walk from Sacre Coeur, 3 minutes walk to the closest metro station. Very good connections with public transport overall, metro area 1 !
Simon and his wife were flexible with our check-in/check-out, which was great for us. We had a great communication and they were fast in helping us out with any problems, since they live in the same building.
We slept like babies, it was very quiet, the windows are facing an interior yard, even though the neighbourhood is full of local immigrant businesses, supermarkets, cafeterias, boulangeries and food market in the afternoons. It may seem like a shady area at night, but we never encountered any problems with the people on the street, even when arriving at midnight.
For us the apartment was a bit chilly overall, since our stay was in November, but it has heaters though.
Kitchen was spacious and it had everything we needed for quick meals.
We would like to come back someday!