I spent 5 nights at Quentin's place, and I really liked it.
I shared the apartment with him (he was sleeping on the sofa).
The apartment is a bit small but really cozy, good for resting after a long day of visiting Paris.
With the nearby metro station (Parmentier), I was easily able to go everywhere I planned to visit with no difficulties.
Quentin is great host, very welcoming and open to help to make sure your stay is great.
Recommended for solo travelers!