This is a shared tasting room/winery located on Treasure Island, San Francisco, CA. The third winery sharing the space wasn't pouring any wines when I was there. They are one of four tasting rooms on Treasure Island.
The tasting room is spacious even with all the t-shirts and winery kitsch that is usually saved for the larger winery tasting rooms. The staff was very friendly and the winemaker for Stein Family Wines was pouring as well. The tasting room was busy, but not crowded when we went. They were doing a prawn paella banquet that day so when it was ready the room cleared up a bit and we were able to taste in peace. Even with the place crowded, the acoustics were such that were could hear each other and the winemaker just fine. They charge a small fee to taste up to five wines of the ten plus wines to choose from.