I haven't been to Puerto Viejo de Talamanca since New Years 2008, so, I bet a lot has changed since my last visit. I loved my trips to PV, and stayed at Hotel Kayas Place, owned by my friend, JT. (
www.kayasplace.com). Unfortunately, Kayasplace, does not meet two of your requirements (AC & a pool).
Banana Azul probably would be more to your liking:
http://www.bananaazul.com/index.php. I've visited there, and it is a nice place, but a little pricey. The hotel has a pool, jacuzzi and a few units with AC. I believe the dueno, Colin, is a registered member on CRT.
PV, is very hot. Stay out of the sun between the hours of 11 am and 1 pm. No p4p in Puerto Viejo. Lot of very nice beaches just south of PV (Cocles, Punta Uva, Manzanillo). The Manzanillo - Gandoca preserve is just 14 kms down the road from Banana Azul... and the Kekoldi Indian reservation in Bribri is just half an hour away by car or bus.