First and foremost, the staff bent over backwards for us, and that made our stay much better.
And the location is great: the beach is very nice (though often too windy to use) and Old San Juan is very close.

Still, to avoid you being disappointed, you need to know before you go, that:
1) the hotel is in a sorry state of disrepair:
- both rooms had severely clogged drains
- plaster fell down from the ceiling while we were there
- the shower had hot water only if the sink faucet was on at the same time (!)
- bathroom outlet had no power
- bathroom mirror reflecting surface was rusted throughout
- the fan was set to suck air (winter setting) instead of blowing air (summer setting)
2) Other than the two rooms facing the ocean (#11 and # 12), the rooms are claustrophobically small and face a courtyard with loud air conditioning units going on and off every 45 seconds, day and night (see included picture)
3) The "luminous pool" is actually a tiny, dark cold plunge, squeezed between the reception cubicle and the restaurant tables; it would be rather awkward to go in it, and, in fact, we never saw anyone dare to use it. (see included picture)
4) The restaurant is shockingly expensive. The continental breakfast's emphasis is on sweets (jelly donuts)
5) Yes, the hotel is on the beach, but there is a tall wall in between. You can reach the beach through a door in the wall, until the door is locked in the evening. Not quite what you'd imagine when you think "hotel on the beach".

(I'd accept all this in Mexico for $ 40 a night, but not in PR, and especially not for $ 170 a night.)

As long as you understand the above, then you shouldn't be disappointed by this hotel.

Again, the staff took great care of us, and that made up for everything else.

Also, be aware that the hotel is in a gated community, so you have to pass through a security gate to enter the neighborhood. It's not a problem, but it surprised us. For the same reasons of security, the hotel has no open lobby, but a closed door monitored by cameras that is more reminiscent of a prison's entrance than a hotel. (See included picture) Again, no problem, but just a bit surprising.

If you are looking for peace and quiet but are close to all the other attractions, this is perfect. Beach is a few steps away and a light breakfast is included. The staff was great - very helpful. We could walk to many restaurants and hotels which were within a mile from our location. If you wanted a cab, the staff would call for you (cabs can get spendy and we enjoyed the walks). Hot water did seem to be an issue sometimes and there is no Wi-Fi. Overall, this is a great place to stay.

Stayed there twice and always enjoyed the experience. Very friendly and attentive staff. It's right on the beach, with walking distance to Dorado.

Greetings, Travelers! Let's get sorted. If you seek an American style, standardized, luxury resort experience, please move on to some other property (and leave this amazing, delightful, life-changing place to us). I chose Numero Uno after extensive research based on my desire for our group of two families with three kids between ages seven and nine to "go to the place and be in the place" as opposed to "go to the place and be in [Wisconsin reference, please Google] the Dells." Best call ever. We're in the process of booking next year's trip.

Numero Uno is an incredible value on the best beach in San Juan. It boasts immaculate rooms, world class service, and a restaurant whose food will make you weep with joy. This is a small, unique property. It's in a neighborhood where you can safely walk to restaurants, stores, and a 24 hour Walgreens. The downside? If you've traveled outside the U.S., there is none. If you haven't, or you're not prepared for randomness, I'll shed a tear as you retreat to your boring all-inclusive.

Plaster might fall from a ceiling. There's a possibility your refrigerator, overwhelmed by the glorious humidity, decides to start spouting water like poor ol' Ponce de Leon's long lost fountain of youth. The sofa bed will be, well, like a sofa bed.

Shrug it off.
Seriously.

In the morning you'll wake up in a place that's so lovely it limits your desire to do touristy things. There'll be a reasonable continental breakfast, rendered unreasonable by the fact that you can have it on the beach. Or you could get up early and walk a couple of blocks to Kasalta (bakery/deli/coffeehouse) and get delectable morsels and espresso for the more lethargic in your group.

Again, if you want a boilerplate, this-is-how-we-wish-it-on-vacation, experience, Numero Uno is not for you. If your soul hungers for the simple and the sweet, book your rooms now.

We're two weeks back, and we still can't get the sand out of the kids' clothes or the happy out of our hearts.