We took a charter from USA to Punta Cana. At the airport we took a taxi ($30) to Playa Cortecito. The taxi driver took us right to the front steps of Guadelupe's guest house, Posada de Piedra.
We made reservations directly with Guadalupe by phone, and then sent a fax confirmation. I'm fuzzy about the rates...seems to be $25-30US per day. She has three rooms. One is spacious with a private bath. The other two are smaller and share a bath. She offers breakfast or lunch for an additional amount.
Guadelupe and her husband speak Italian, Spanish, and English. Apparently she is an internationally known musician. She sang at one of the well-known night clubs in Sto. Dgo while we were there!