Don't be fooled by the antiquated web graphics.

No amount of marketing in the world will sell an overpriced listing.If you get it listed at a good price for the market and your friend cleans it up on the outside and inside then your marketing efforts should pay off in some offers from buyers.If your friend starts off high ( they all like to usually ) only go maybe 5% or less above the current sold's in the last month and then have built in markdowns for the listing contract.Make sure co-op is great to buyers broker/agent to drive traffic to the property.  

But when I am using the mobile version through a web browser, I can't read the right half of messages due to the font size (and pinching does nothing).

You won't see much traffic here from Rhode Island just think how small it is compared to a Texas or California. 

One other thought I forgot to mention for you specifically would be to make sure they are using cloud/web based property management software.  

Many areas have much of this online. do some web searching  or ask around for some of these sites at your local networking groups.

From these the high traffic areas (especially during summer and Easter seasons) are definitely Boquerón, Cabo Rojo and Aguadilla.

I would only use platform-agnostic, ie, web-based apps.

Do you all do a questionnaire handout or have web pages for your REIAs? 

I can not find any information  about your company other that a home made Web site which lists no properties.