The apartment is more than well located, Parque des Enfants Rouge, Canal St. Martin as my favourite spots in Paris are 5 minutes walking distance. Centre Pompidou 10 min. So it is perfect if you would like to be a parisian for a couple of days!
The apartment is clean, light and ! calm !. It is on rue de Temple but you can not hear any noise of the traffic, you can sleep well. Everything is comfortable, but take into consideration that the space in a flat in Paris is tiny.
Khal is a great host! He is the best host i have ever met during my airbnb experiences!
I definitely recommend to stay at his apartment, i would do it when i am in Paris next time.