Not many tourists visit Posadas so this hotel caters mostly to local businessmen. But it has many qualities: its central location close to the main plaza (5-min walk to Cavas Resto & Wine - #1 in Tripadvisor as of March 2013), its lovely breakfast (unlimited dulce de leche), and its super-friendly service by some English-speaking staff. Because we booked an evening flight to BA, the hotel even let us use the fitness to take a shower after checking out.
Any disappointment? The rooms, though relatively large, are nondescript (no decor whatsoever). Maybe one painting or two will help.