A group of 10 of us stayed for two nights Mesón Santa Elena is an old colonial-era mansion about 4 blocks from the main plaza of Mascota. My room was very spacious and the decorations were nice. I had a king-size bed that was comfortable (unlike the usual slab of concrete that passes for a mattress in Mexico). The bathroom was also spacious, clean, and had a hair dryer and large towels. There was plenty of hot water in the shower, which is not always the case in Mexican hotels. The staff spoke only Spanish, but they were very attentive and helpful and they served a good breakfast. There were a few minor glitches. The room locks were difficult to operate until you got used to their quirks. One woman in my party managed to lock herself in her room because of her difficulty with the lock. The staff rescued her after a few minutes. The TV remote in my room didn't work and we discovered that it had only one of the two batteries required. Most of the channels got poor reception, but that may just be due to the relative remoteness of Mascota. Over all, the hotel was very charming and comfortable, although a bit pricey for Mexican hotels.
Pros: Very historical site, good location in town, great staff.
Cons: Attention to details, like properly functioning room locks and TV remotes that contain batteries.
Location: Mascota is one of Mexico's designated "Magic Pueblos", which means that it is very clean, has an interesting history, and great old architecture.