Mercedes is a fabulous host! She responded almost instantly whenever I had a question or problem. The location is super convenient: the metro station is practically across the street, and it's an easy walk to the Marais for exploring.
I was lucky to stay for a month, so every moment didn't have to be scheduled down to the second. I appreciated that Mercedes offers Netflicks, and on evenings I was tired, I got take-out food and caught up on some shows.
There's only a couple of downsides--there is no elevator so you must climb 3 flights of stairs to reach the apartment, which wasn't too bad except when moving my 46-pound suitcase. Also, the bedrooms are on the street side of the building, and it was a little noisy on Friday and Saturday nights. It was cool during my stay, so I could keep the windows closed at night, but it might be a problem during warmer months.
Overall, it was a great deal for the price, and I'd definitely stay there again.