If you are looking for an affordable, super clean, very well localized place to stay in San Martin de los Andes, definitely Hostal del Esquiador is a place to stay.
The room is super clean (they have and excellent room service, changing towels and soaps/shampoo everyday, make the bad and turn on the heating for after-mountain), has a LCD tv and a small refrigerator/freezer.
Breakfast has everything you need: not fancy but super good (medias lunas, bread, cakes, cereals, juice, dulce de leche, etc).
They can arrange the airport’s transfer for a very reasonable price (taxi is 900 ARS and the transfer was 300 ARS) and the transfer to the Cerro Chapelco.
Everything that I asked to the reception/adm was promptly provided and people (I think is a family running the business) were incredibly nice and always in a great mood (very rare to Argentinian :o).
I return to SMLA almost every winter and definitely it a place to search for the next times.
Well done, Hostal and Hotels.com!