I recently stayed at the Holiday Inn Glasgow Airport and had a great sized room looking onto the airport.
The room I had was of a very good standard and clean, looking into the airport and found no issues with this being a room to sleep in the day before your flight.
The food choice had changed since I had been there but still offered a good choice to eat at reasonable prices.
Staff service was friendly and had no issues at all.
There was a very good choice of TV channels along with movies you can pay extra to watch and the movie selection was also very good.
Overall I would highly recommend the Holiday Inn due to its handy location being right next to the airport so you dont have far at all to go.