I've never had a Doner or a donair before. So I don't know anything about the authenticity of the food here. But all that matters to me is if it's good, and the food here is good!
I had the doner with chicken and halloumi. Both were the same price, and so they said I can get it with half chicken and half halloumi. Having never had halloumi, I said "SURE!" Halloumi is a cheese. It's firm in consistency. I think the outside was fried a little. I asked for all the fillings and all the sauces. The result was awesome deliciousness. The hot sauce wasn't overly hot (actually not hot at all, to be honest). But along with the garlic and yogurt, it was an interesting combination.
There's a small number of seatings (3 or 4 bench tables and two smaller tables) inside and some outside tables too. It was too cold to sit outside and there wasn't enough space for a large group to sit together. Also made it awkward for a large group to stand and wait for their food together as well. That's the only thing I'd note about coming here: maybe come early to get tables (to avoid the lunch time crowd).
Oh and maybe add fries to the oner as well. i didn't get that and watched in envy as people devoured theirs with fries...though mine was really good without fries.