Mario's place was in a great location since it was close to the Santa Lucia station but still far enough to be away from the crowd. Tatiana was extremely hospitable and was quick to help us with things; it was a pleasure to communicate with her. The check-in instructions were *extremely thorough* so that we had no problem finding the building. The apartment itself was well furnished, the AC was great, and had mostly everything we needed. We did have an issue with the hot water as it wasn't working the day we checked in, so we were without hot water until it was fixed the next morning.
With all that being said, however, do be aware that while the apartment looks extremely spacious and bright/modern in the pictures, in real life it is not as big and definitely not as modern. While it didn't impact us negatively and we still enjoyed our stay, it was disappointing to see the apartment was much different in person that what was shown in the pictures; much smaller, the colors of the apartment are anything but white, not nearly as bright or modern, etc. So, just do be aware, while the apartment is still a great one and well worth the price, at the time of me writing this review the pictures did not accurately represent the final product and that can lead to some disappointment.