We felt nice and safe in the apartment. The contact with Nicolas is really great. He answeres very quick and he arranged an early check-in for us on the day itself. The neighborhood is also very nice. You can easily walk to the sacre coeur in 20 minutes. There are a lot of nice bars and restaurants at this side of the hill of the sacre coeur and it is less touristic which we really liked. However, the touristic side is really close by if you liked it more. We did a 'No diet food tour' through this neighbourhood and also booked this on AirBnB (good tip to explore the neighbourhood). Besides, if you want to go somewhere else in Paris, the metro or the bus are both really closeby.
The appartment is small but cosy. We loved the location.