What we liked:

1. Claudio picked us up and dropped us off to/from the ferry dock.
2. Claudio helped us find a reasonably priced rental car (don't expect miracles here--it was about the same price I found online myself, but it was pretty much as cheap as what I had found myself). Claudio drove us to pick up the rental car and drop it off again in a nearby town.
3. Claudio recommended some good restaurants that we liked and were a good value.
4. Claudio recommended good things to see and do on Santorini.
5. The apartment was spotless and very nice.
6. Unfortunately for us, Claudio's wifi router started failing while we were there. It wasn't a total failure--it was just sometimes the wifi worked, and sometimes it didn't. Once Claudio figured out that the problem was the router, he replaced it immediately and gave us the new password.

The main things we didn't like:

1. Road noise. The house is right next to a fairly busy road. It's the road you take to get to Red Beach and the most famous ruins on Santorini. Santorini is unfortunately full of ATVs driving on the roads all over the island, and they are especially noisy.