Avellaneda is a tiny Castilian village whose appeal for budget travelers is precisely its small scale — accommodation is essentially a handful of casas rurales and posadas, and the main attractions (Plaza Mayor, Iglesia de San Juan Bautista, Sierra de Ávila trails) cost nothing. Costs cluster around lodging, food, and getting in and out of the village, since the nearest broader services sit in Ávila city.
Daily spend is most controlled by timing: May–June and September–October are noticeably cheaper than July–August, when rural houses fill with Spanish domestic travelers. A car unlocks the trailheads along the Río Tormes corridor and saves repeated taxi runs; the local bus is fine for one Ávila-city round trip but not for daily exploration.