They provide gluten-free pizza, but it's not stated on the menu, so you need to ask the waiter which ones are available. Also, the extra price isn't stated, so you might have to ask that as well.
We ordered a Combo Menu 3 (Cheeseburger, pommes, 0.5L drink) and a gluten-free Classic pizza. Both were tasty, had a fair price and reasonable portions. There is a small table inside, but actually the restaurant is mainly seated outside, right around the corner, so there is plenty of tables to sit. The service was quite fast even though there was only one waiter.
We had 3 slices of pizza left, which we asked to be packed. It got packed with wrapping paper and a plastic bag (edited) for free.
Edit: The item title on the bill was misleading for us, as it said "Pijaca Take-away", and we thought we got charged €2.80 for the packaging, but turns "Pijaca" means "drink" in Slovenian, which referred to a bottle of Fuzetea we had.