My girlfriends and I spent 5 nights in San Juan. The best part about this apartment is the location- its proximity to the beach, restaurants and taxi service made it very accessible and walkable. We felt safe in Condado and in this building and enjoyed having a more 'homey' place to stay in place of a hotel or resort.
My caveat with this place is that it came with a few surprises (full disclosure, this was our first time in a VRBO, so it's possible this is the norm). (1) There were no beach towels at all, as promised in the description, so we had to buy those (2) There were no paper towels, hand soap for either bathroom or soap for the showers. We also had to purchase TP on the second day because there wasn't enough to last us our full stay. (3) Sebastian was difficult to get a hold of, both before arriving and once in PR; but when I DID hear from him, he was quite helpful.
To sum up, this isn't a hotel, from both a customer service and overall experience perspective. We were surprised to have to purchase the items we did, but it did not tarnish the trip and we had a blast in Puerto Rico! I can't wait to return.