AC Hotel Málaga Palacio
I agree with the previous report that this is a nice, central hotel in Malaga. You can take a bus to the hotel from the airport and do sightseeing of central Malaga on foot. The hotel is category 4 now.
There are no benefits for Gold/Platinum members except for free Internet: you can request 24 hour access cards at the reception. The minibar is free for everyone.
The hotel has a great rooftop pool on the 15th floor. It's also worth going up there for the views of the city.
The stop for the bus to the airport is about 2 minutes away from the hotel on Paseo del Parque. According to the Internet, bus 19 goes to the airport but we were told to use bus A (which I believe is slightly faster). It was 2 EUR per person.