It tried typing Phong Hai into Google Translate to see what it really means. I was expecting it would mean something like "Beautiful Rose Garden in the Mountains" or something along those lines. The best GT could come up with (using the auto-language detect setting) was "Hai Phong" (from ¡Spanish! if you are to believe Uncle or rather Big Brother Google). So, like someone who has yet to visit that beautiful rose garden in the mountains, I am, sadly, unenlightened.
I'm not a connoisseur of oriental food, merely a consumer; and a fairly undiscriminating one at that. The food is ok, I've been there half a dozen times. That may have more to do with the location, rather than the quality of the food. The setting isn't particularly great, it's near the road in what can best be described as a "semi-industrial" location. Distance from my home, however, is excellent. It is located a mere five minutes or so away. The journey back invariably takes a little longer as my belly is usually full to bursting point with food and beer.
On my first visit, I had a stir-fried rice dish with pork. It wasn't overly spicy for my tastebuds (which is the way I like it anyway). Washed down with a couple of beers, followed by an ice cream dessert. After that first visit I've been opting to have the chicken Vietnamese-style served on a ludicrously hot cast iron plate. It's served with rice and that good old-fashioned Polish staple, surówka (shredded raw vegetables). The portion size is generous particularly with regards to meat. Another thing is that while waiting for your meal you have some prawn crackers to munch on and dip into the sweet and sour sauce.
So, overall. The food is more than passable and it's a good place to sit outside in the summer (provided that you are unlucky and manage to avoid a smoke cloud from smokers at adjacent tables). It's good fast food ideal for lining your stomach before hitting the pub, so I might well return there even despite not being able to sit outside.