Marcos apartment is nicer than any hotel you can stay in and the price is phenomenal. This is one of the greatest airbnbs we have stayed in and was in a great location as well. You are mere steps from the Duomo, Medicee Chapel and some of the best gelato in Italy.
Check in was easy and quick. The tips in the apartment were excellent as we are at ituscany2 which was recommended and had a fabulous Florentine steak dinner.
Do not let the stairs scare you away, if this place is available, book it immediately. You will not be disappointed.