I rented the house for my 35th birthday celebration and arrived with two friends in-tow. The house was perfect for three people--three bedrooms and two full baths. There's also a small, detached cottage with an additional bedroom if you need it. The master bath is amazing--complete with a shower for two (it could probably fit four people!). The mater bath also has direct outside access to the hot tub.
I was really impressed with the outdoor space--the hot tub is great (or course!), but there are two dining areas, two lounge chairs, an outdoor pond (although there were no fish in it when we visited), and an outdoor lounge area. So when you want to come home and unwind after a day of wine tasting you'll have plenty of space to do so. (But, bring the bug spray. I returned home with several mosquito bites.)
The kitchen is upgraded and fully furnished. You can definitely cook at home if you want. There's even a built in wine fridge!
The location is great, too... more