I did not want to break the bank, staying in Paris, and Carlo and Melissa's apartment were perfect for that. The apartment is under a 10 minute walk from the metro stop and then, about a 20 minute ride into Paris. There is also a super market on the way, so it was very convenient to pick up snacks. If you are into beer, there is also a beer trader place on the way, too, with a friendly owner.
Two warnings I may give: the staircase is very narrow and about six stories, and the elevator is tiny. I barely fit with a backpack and one of my suitcases. Furthermore, the shower is a little short, especially for someone who is 6'5". Communication was slow, and we were stuck outside the building without instructions. Fortunately, a passerby noticed our lost faces, and attempted to help but it was difficult to communicate with our respective lack of knowing the other's language. He was able to flag down a super helpful guy, who let me use his phone.
Even with those "issues," I would stay again... It was pretty cool to have a clear (albeit ~5 miles away) view of the Eiffel Tower.