We booked this hotel a few months in advance through an internet booking site. Special rate, breakfast, confirmation by credit card number, looked great.
BUT: When we arrived early evening we were told that the woman that handles the reservations (who wasn't there at that moment, too bad) had done mistakes, so all rooms where taken. But the man had made a reservation at the hotel of his brother (or cousin, I can't remember, they didn't look like related), across the street. The rooms of the Art Mary looked reasonable,but the other hotel was impressing, I won't even describe it - worst hotel I've been in my life. For 100 Euros!! Without breakfast!! We had to negotiate to pay the rate we had booked, to get our breakfast, pay in advance, cash... When we dared to complain at the Art Mary hotel we were told quite rudely: "it's the other hotel or nothing" - that's hospitality and service, isn't it? (it was the weekend of the Rome marathon, so no chance at all to get any other hotel)
Funny that our friends that had booked way after us, that even arrived after us, did get their room. Maybe because the guy preferred Spaniards (we're French), or maybe they had a less advantageous rate?
