Paul's apartment was the perfect stay for my solo Paris trip. Yes it is a small apartment but it is perfect for one or two people and has everything you need. It's located close to sacre cour and the neighborhood is beautiful. I would suggest going up the hill (left as you come out of the apartment building) as it is a safer, much nicer side to the neighborhood and I felt safe at all times.
There are some good restaurants and cafes and super markets in the vicinity. The metro is really close by and I really loved the Montmartre neighborhood, if you walk up the hill the area is just amazing and beautiful.
Paul was away during my stay but was very very helpful and communicative and went out of his way to accommodate me.
The neighbors kids can be a bit noisy during the day but you don't hear them at all at night so it's a good, restful sleep.
Would stay again.