We were 2 families of 7 people. The apartment was very near to the metro and in an area full of shops and restaurants including supermarkets. The bakery was just outside the door for the freshest croissants ever!
We walked to the Sacre Coeur and it's a great walk through an interesting area. We were met by Mathieus brother at the flat and all went smoothly. We drove and used the parking space near by for 10euros a night. It was a squeeze for 7 with only one toilet and a separate bathroom. 3 people will need to share the sitting room on the sofa bed and sofa, so you need to make sure this is a combination that works. The two double bedrooms were fine. We also only had one key which was a challenge, but we didn't ask for another so this may be possible. All in all, it was a great location and the flat was as described. We would go again but with fewer people.