The easiest way to get to Playa from the Cancun airport is to take the ADO bus, which costs about $180 pesos (or $10 dollars). They leave regularly from the airport, tickets can be bought from ADO booths near baggage claim or (I believe) curbside by the buses. These buses are comfortable and take you right to downtown Playa del Carmen. From the bus terminal (located on Benito Juarez Street) you can take a 5 min. taxi ride to the house. Taxis anywhere in Centro Playa should cost you only 3 o 4 dollars, anymore and they, on Christmas Eve and New Year they charge double fee.