This apartment is great! My favorite part was having a full sized kitchen, with a blender and normal fridge. (I've stayed in many Parisian apartments with toy-sized kitchens so this was a nice change). The apartment looks into a courtyard of a large apartment building - its on the first floor (aka the 2nd floor for Americans) and has no elevator. The building is a little old but the apartment is fully renovated with a new kitchen, lovely decorated living room, and large bedroom with plenty of space. It is relatively quiet, except for the noise of other tenants from the courtyard and the neighbors with kids, and feels very safe. I found the apartment to be exactly what I needed (I stayed 1 month) and had a very positive experience overall.
The location is about 6+ blocks away from the Canal Saint Martin, which is a very trendy hipster area with lots of bars and restaurants. The canal area can be a bit grungy so if you prefer clean quiet streets like in Saint Germain, this might not be your perfect spot, but in general it is an easy 15 minute walk to Republique where you can take the metro to go anywhere. The street and surrounding areas around this apartment were a little dirty and grungy for my taste. The 10th arrondissement is a gentrifying area so some areas (like the canal) are cute and cool, and other parts are more lower-income housing, eclectic, international, often times a bit unclean or unsavory, but to be sure: I never felt unsafe. I stayed here a month and ended up enjoying much of what the canal area has to offer - great restaurants and a lively young, hip vibe.
Overall, I would definitely stay here again. Sarah was a great host - very responsive and easy to coordinate with, and super nice. Thank you for the great stay!