This is a nice flat in a great part of town. It's right between Canal St. Martin and Strasbourg St. Denis, Gare de l'Est and Republique. Really ideal, with lots of good cafes nearby. Greta and her co-host are helpful and pleasant to communicate with.
The flat is up several flights of stairs, facing an open courtyard. The large windows provide great light, and give the small space a larger feeling, along with a big, antique mirror. The curtains help in the mornings. The bed is comfortable, though charging your phone by the bed is difficult (as of this writing). The couch isn't so comfy, and the kitchen isn't ideal for cooking, but these aren't priorities when you're exploring the city!
It was very hot at the end of August and a fan was needed. It was nice that the hosts managed to bring one over during my stay. Overall, the flat has all the essentials, and is a good option for a place to crash in the 10th arrondissement.