Sultan Babulah is small. It definitely is NOT international in any way, but the volcanic backdrop is nice.
There is NO coffee franchise, just a little bistro where nice ladies make quite good Nasi Goreng. The toilets are much more provincial than e.g. at Manado Sam Ratulangi, but at least one of them was western standard.
Verdict: Survivable.
You haven’t seen the old airport. This is the new one with lots of amenities, compared to the one before.
I probably would have felt very unhappy at the old one. I am addicted to luxury and the existence of toilets…