Well, OK.
And just checked now and, for example, Posada Tulum06, a nice, clean, attractive, basic place with ac, in room fridge and coffee maker, and a plunge pool, at the north end of the pueblo in Tulum, just back off 307 one block, has availability for the stated dates. Taxi or bike to the beach and the ruins, and several cenotes. Walk to all pueblo restaurants, bars/clubs and shops. Bus to Coba ruins.
Fairly easy access from/to Cancun airport on the arrival departure days.