I am a frequent traveler and I had some issues with this hotel, most of which are not worth detailing - but, along with some good experiences I left here feeling neutral.
There is a shuttle bus service from the airport, which is quite convenient. I believe it was $10 each way. It's quite a haul from the airport to the hotel, so I recommend it (rather than taking your chances on an airport taxi).
The rooms are nice - ask for one facing the volcano. The hotel is located across the street from Metro Centro, so you can walk over to do some shopping or grab a bite to eat.
I found the doormen to be very helpful, and provided us with more information than the concierge did. They also gave us all the options (not just the high-ticket/low interaction group tours) for sightseeing. They were very friendly and made recommendations, seemed very eager to please.
There's a nightly turndown service, which is nice. I didn't take advantage of many of the hotel's amenities or restaurants, as we were on the go most of the time.
If I return to San Salvador I will probably go to the Hilton Princess to see if the service is any better there.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.