I took the airport bus that dropped me at the Palacio de Congreso. The hotel is less than 5 minutes walk from the conference centre, just across a small playground.
This is a 4-star hotel and the hotel staff at the reception was helpful. The room was adequately furnished with an small outdated cathode-ray tube TV. Housekeeping forgot to top-up our shampoo and shower gel for 2 days and we had to ask for them at the reception. Breakfast was 9 Euros and expensive for the limited spread. I could get coffee and a croissant at cafes nearby every morning.
Get the bus schedule from the hotel reception and you can easily plan your return trip to the airport. The fare is only 3 euros.