We had a great stay at Marcela's apartment! It's a great size, especially considering how close it is to everything. Three of us fit nicely, but another person could easily have fit as well.
There are multiple metro stations close by, as well as lots of nice restaurants and bakeries. It's a short walk to the very centre of Paris, only 20 minutes to get to the Hotel de Ville on foot. Everything is very easy to get to!
Also, the apartment was nice and clean. Marcela gave us very detailed instructions how to get to the apartment and how to get in well in advance so we could organise ourselves ahead of time
Overall, I would absolutely recommend staying at Marcela's apartment in Paris!