Hotels in the Sacred Valley are by and large good value, with friendly hospitable staff and low ceilings. Take care if you're tall! It is worth checking what the hotel rates include, as most don't include breakfast, but you can usually get it for a reasonable fee. Many hotels in the Sacred Valley can arrange local tours, often at a good rate.
There are a range of hotels in Pisac to suit all budgets. Some have a great view of either the surrounding spectacular countryside or of the ruins. There are places conveniently close to the Pisac Market and local transportation. 
Just a bit further up the valley, accommodation in Urubamba is limited to just a few lodgings. This is a great place for budget travelers to pick up cheap accommodation.
Ollantaytambo hotels are, on the whole, a good bet with cheap bed and breakfast options, through to more expensive places set around pretty courtyards or in well-kept gardens. Several places here offer a scenic vista over the ruins or a backdrop of the mountains. Shop around for a good deal.