The location is right at the end of Parkes St on the corner of Saigon St. It's maybe 2 mins walk from exit A of Jordan MTR.
It's a Chinese place in which as others have said there are things on the menu to indicate use of eggs, cheese, butter.
I went for the mix vegetables in curry sauce. Very nice and a decent sized portion. It was 68 bucks (I didn't order any rice). When I was sat at the table I was presented with a small nibbles dish with some marinated tofu. That cost 9 bucks. I declined the tea so that when they added 10% the total bill was 85 hkd.
There we 3 menus. One was in Chinese and English, the other 2 in Chinese only (supplemented with pictures).
I enjoyed my food here. If you are in the area it is comparable to most of the local food style vegetarian places in this sort of price range. It wouldn't describe it as anywhere especially worth travelling a sizeable distance for, there's a ton of places like this around Hong Kong.
Cons: Unremarkable enough to merit travelling