Hi Fred,
Thanks for the compliment(s)!
In theory you should now be able to get high speed Internet access via DSL from within 3 - 4.5 kilometers of any telephone exchange in Costa Rica. The connection is asymetrical so the upload speed would be slower than the download speed, which can run from 64 kpbs to 4096 kpbs. The upload speed can be from 32 - 512 kpbs, but will always be from 1/2 to 1/8 of the download speed.
I am not a hardware person, but as a practical matter you might also contract cable Internet as a backup. I ran into the owner of a local Internet café and he has had trouble getting the DSL going, so is going to leave the cable service as a backup.
Your best bet would be to look at a rental in the most developed parts of the Central Valley, depending on your ideal home it could be downtown, Escazú, Santa Ana, San Pedro or Curridabat. We don't have any realtors specializing in short term rentals in this area, so you are kind of on your own there.
If you are wanting to be at the beach, there is a good chance that Flamingo or Tamarindo could meet your needs. Contact Gerald at ABC Real Estate
Beach Rentals Tamarindo for an update on the current availability of broadband, you might be pleasantly surprised. Another possibility is Flamingo where a lot of Americans live - contact Larry at
Beach Rentals Flamingo for short term rentals and the current status of broadband there.
Good luck