My girlfriend and I stayed September 13th through 15th. We'd originally planned to stay only two nights... the decision to spend another night at Zinscape was the best decision we made our entire vacation.
The cottage was very clean. Kitchen was amply stocked with cookware and staples so that you can eat in if you'd like. There's also a general store a 5 minute drive down the road with amazing sandwiches and provisions. Bathroom seemed recently renovated - double sinks, oversized tub, even a wide array of toiletries in case you forget something!
As others have stated, the accomodations are very quiet despite being next to the house. We had the pleasure of meeting and talking with Bruce, who had wonderful suggestions for local wineries - including unique opportunities for barrel tastings, cellar/cave tasting rooms, etc. - and restaurants, all of which excellent! He even helped us plan a scenic trip on our way out of town back towards SF. That said, we were never bothered and had all the privacy we could have asked for.
When we come back to wine country, this is where we will stay.