so there are no 5 star hotels in Pamplona. I was there for business and stayed here for 3 weeks. The staff is great, the rooms are pretty average compared to any higher end hotel. The location is great since it is close to the old downtown Pamplona - everything is walking distance except the airport.

I went there during St Fermin, paid 800 Euros for one night. There are much better price-quality hotels in Pamplona, with normal practices.
Be careful once you book during this period they will not refund you. They don't make it clear when you book. If you do want to cancel, just lose and cancel your Credit Card, it's no big deal at all, your bank will replace it for free.
Example of abnormal hotel practices :
They won't allow people to visit you in your room.
I came back in my room at 2am, absolutely sober and clean, but with a can of coke, they refused me entrance ... I had to finish my coke outside.
They basically assume tat you are the worse customer possible. It is their approach of being fair.

Ideal modern hotel next to city centre. Next to beautiful city park. Impersonal hotel since it is too big. Breakfast a rip off.

It's a decadent 4 start hotel, but still keeps some of its shine. I stayed for over a month, and can't really complain, since other hotels I tried first were, by far, much worse. Pamplona, for the time being, does not have 5 star hotels, so Tres Reyes is in comparisson the city's best. It's location is great. Ask for a room with a view to the old city.