I've done a few tasting trips to the Napa / Sonoma area over the years with large and small groups of friends. Usually we've planned ahead and picked where we're going to go ahead of time. On a recent trip a friend and I just wandered. We started at Martini in Napa and asked for recommendations. Goosecross was one of them, and it's off the main drag toward the east. I wouldn't have otherwise looked for or found it.
Goosecross is a small winery. There's a private residence right in front. Walking to the tasting rooms you'll pass some equipment outside. The tasting room is a bit narrow because there are casks and vats right behind you, but it's not really cramped.
They don't always follow the typical styles of wines. We tasted a Pinot Noir that was a bit sweeter than usual. I liked it, though I was surprised at first taste. They also have a nice Orange Muscat that I liked a lot, though it was a bit outside my typical price range for wines. My tastes run the gamut from dry to sweet, depending upon the situation and the variety. Although this was sweet, I didn't find it cloying.
Some of their grapes are grown on the property. You could see some small clusters remaining on the vines along the driveway. If I recall correctly though, they buy the majority of the grapes they use. There's a nice little map in the tasting room showing their layout by variety.
The staff were pretty nice, though maybe a little talkative. Overall I liked the place and if you're looking for something a bit different in a small winery, I would recommend it.