Youssef is a wonderful host (six stars!). He is very kind and helpful, and he responded to all of my questions very quickly. He speaks English, which is very convenient for international travelers.
He has two guestrooms which are quite large, sunny, clean, and quiet. The kitchen and bathroom are near the guestrooms, which is convenient.
The tram stop is almost in front of his building. On the corner is a nice bakery for a French breakfast or afternoon coffee.
One minute walk south is a beautiful park for a morning run with views over the city.
Two minutes walk north is a supermarket, and eight minutes walk north (Or one tram stop) is the metro and the park de la Villette with its museums and concert halls (the musical instrument museum is one of my favorites in Paris).
The location is on the north east side of Paris near the Ring Road. That means some extra travel time in the morning and evening to access the center of the city, but the area, the apartment, and the host are so nice that I think that little extra travel time is worth it.
I hope I have a chance to stay with Youssef in the future. Highly recommended!