For 2 nights in Stellenbosch, I would recommend the guesthouse 'Kolonies Tuin', they are on Booking.com as well. We stayed there twice in 4 months. They have parking, and a pool, and are within a 5-10 minute walk to town, next to the river. It's easier to park there and walk around town. Use your car to visit Boschendal Winery etc.