I stayed at the apartment for 3 weeks and I really enjoyed it! The apartment is exactly the same as described and in photos. The atmosphere is truly Parisian, very cozy, warm and relaxing. My special admiration is the lovely balcony!
There are several big supermarkets within 1-2 min walk from the apartment, boulangerie and bars.
The location is superb: 3 min walk to Simplon metro (line 4), 8 min to Jules Joffrin (line 12). I would not recommend using Marcadet station. Montmartre is 10-15 min walk. You can easily reach the centre of Paris in 15-20 min by metro.
Florencia is a Super-Host indeed: she responds to all messages and questions promptly, she is very friendly and attentive. She always ready to help and solve problems if any. She gave me useful recommendations re staying in Paris, navigation and the like and was doing her best to make my staying at her apartment comfortable.