Welcome to FlyerTalk,
alejoc.
The buses look nice, and it appears one can book tickets online at the site you linked to. The website indicates these buses run every thirty minutes from the Terminal Aeroservicios to the new Mariscal Sucre airport in Tababela and seem to run around the clock. ¡Convenientísimo! ¡Gracias! (I added your information, with credit, iin my post above.)