There are 3 lounges in the schengen area, two of them used by Oneworld and one is only for Lufthansa/Austrian. The Oneworld lounges are sometimes overcrowded because they are small, but it depends when you will stay there, and if you stay in the schengen-area, i propose the Audi Lounge which i find more relaxing than the others. All of them have free internet, television, the selection of snacks and drinks are ok. As Budapest airport is under reconstruction and will be extended, the situtation will be better soon (at least we hope).