Marco was extremely helpful in providing directions for arrival and instructions for our stay. He greeted us with a smile along with his girlfriend, Laura, and both were more than eager to help show us the apartment and give recommendations for the city.
As for the apartment - it was spectacular. Yes, there were stairs, but the description makes that no secret so it's the renter's own fault if they miss it. Even with the climb, it is totally worth a stay here, as the apartment was clean, spacious, interesting, and stocked with everything anyone would need for a short or long stay. On top of that, the location is absolutely perfect - no more than 20 minutes to walk to any sights or points of interest or travel.
I wholeheartedly recommend staying in this apartment if you are in Florence. Not doing so would be a mistake!