There are not really any long term rentals in the Playa Remanso area. They are pretty much all weekly and nightly vacation rentals. You can however find long term rentals 20 minutes North of town in the Playa Marsella and Playa Maderas area.
Here is the link to an article we published on our blog that you may find helpful:
If you'd like assistance with your rental search in San Juan del Sur my husband and I offer Home Finder & Relocation Services and would be happy to work with you.
For full details on our service just click on the link below.
Cheers,
Elisha