Honestly, i would rate the trip lower, but the problems I had with the tour was not at the fault of Guide to Iceland.
I flew in from Anchorage Ak, and while en route, i had tight layover at Seattle WA. Due to this, my main luggage with all my cold weather gear wasn't there when I arrived. Luckily, I had all the clothing I needed for the blue lagoon, and the next fews days in Iceland, they had some, but not all the gear i needed that was in my luggage, in some places I went.
Otherwise, the trip overall was perfect! Loved the hotel I was at, the bus stop system was useful, and the busdrivers will go out of their ways to help their customers if they are lost, or can't find them.
As I said before, I would recommend anyone try to fit as much needed luggage in the carry on bag in case of tight layover and the baggage doesn't make it.