We went during the Christmas holidays but it was not that busy. Street parking was not that bad either. Walking down the steps with snow covered shoes however was a bit of a pain. But once you're in it doesn't really feel like a basement as it's a nice wide space with about 20-30 large tables.
Hua Sang (and the restaurant right above, I forget the name) is one of the few places (probably) that you can get live lobster this time of year. You could taste the freshness and it was also easy to remove the flesh from the lobster.
We had the fried lobster with ginger and green onion, yang chao fried rice, rice noodle with soy sauce, some beef stir fry dish and one more that I can't remember right now. Usually Chinese food is salty and overloaded with MSG but this day was different and flavorful but not overly salty. We were able to keep it to one pitcher of water and two pots of tea between the whole table, highly unusual.
It is more expensive than your neighborhood Chinese restaurant, but the quality is well worth it. And it is mostly seafood.
Their bathroom was satisfactory. The service was pretty good.