When I went to Paris (at a time of busy May long weekend), I switched from a hostel to hostel. On the very last night, I finally found the hostel that I enjoyed. I had some adventures with the other hostels where I stayed, so this was a relief to have everything go smoothly. But at least, I got to sightsee Paris a bit every day 😀
Le Montclair Hostel
At the very last night, I arrived at Le Montclair Hostel. It looked exactly as in the photos.

Room type: quadruple room.
Cleanliness: rooms and public spaces looked good.
Staff: friendly, helpful, and had no problems with English.
Location: 18th district, close to the metro station (Jules Joffrin), in an area with shops and restaurants.
If you want some excellent price-and-value hostel, I recommend Le Montclair Hostel. I was in Paris in 2017, but I kept their business card afterwards, so I wouldn’t be having troubles with looking for a decent place to stay next time.
Of course, the hostel now is closed due to Covid-19 quarantine, but I hope they will reopen after it ends.