Uber works well in San Juan and a private parking lot is available next to the building of Graduate School of Business, University of Puerto Rico, if you rent a car. Book your room in the San Juan Metro area through https://www.expedia.com, https://www.hotels.com, or https://www.airbnb.com.
The Isla Verde and Condado areas are close via Uber to the UPR Rio Piedras Campus. Staying in historic Old San Juan delivers an exquisite Spanish colonial experience. But traffic can be fierce on and off the peninsula into and out of Old San Juan hampering even the best efforts of Uber drivers.