Hi Ruben,
In terms of places to live in PR you may find usefull my blog "Relocating to Puerto Rico"
If you already know in which city are you going to work, maybe I can provide some suggestions on more precise places.
Concerning Income Tax, it doesn´t matter where your salary comes from, if your labor activity is held in PR, then your contribution will go to the "Secretaria de Hacienda" of Puerto Rico. Tha tax rate will depend on your income level, as it is progressive, and on the dependents you have under your responsibility.
Health coverage: if you can choose I would suggest Triple S adding Delta Dental Plan (I think this is the best value for your money).
Should you have any additional inquiries I would be more than pleased to help you.
Regards,
Miguel Mucci