The tours do use different hotels, but I've stayed in 3 that they use.
On a Europe Your Way tour a few years ago, we stayed at the Hotel 5 Terre. It's in the new town and I was a little worried about the location, but it was great. Not too far from the train station, and near the beach. The breakfast was fabulous, rooms were bright and not too small. Staff were bending over backwards to pease us.
I forget what tour it was, but I've also stayed at Hotel Villa Steno. It's up the hill and up the stairs, but the view is fantastic. I think every room has a terrace viewing the sea. The staff were very nice, breakfast was good, room were very clean.
ON the Village Italy tour about 10 years ago, we stayed at Hotel Pasquale. It's right on the water, a great location. Service and breakfast were good and the room was nice and bright with a sea view.