A suggestion about AIRPORT TRANSFER and keys:

there's a good reliable shuttle service from Queretaro and Leon airports called BajioGo dot etcetera.

They have good vehicles, smart drivers, and I trust them and use them myself all the time. They have a U.S. phone listed on their site which rings in SanMiguel and connects you with an english-speaking person.Prices are reasonable. If you reserve with them, and send me THE NUMBER OF YOUR RESERVATION (tell them at your booking that their driver will be bringing you to#9 Porton, Atascadero, San Miguel) we can then leave keys with their office beforehand, so that regardless of your arrival time, you'll have keys to the front gate and house door and, therefore, access at ANY hour