First of all, Stromboli is a very special place. It may seem small but we stayed three nights and I wouldn't recommend staying less, since a lot of the magic happens at dark.
Secondly, Grace is such a nice host. She really took her time to help us and answer our questions. She even helped us get through a train strike and helped me with a cold.
The house is small but pretty, and the location is perfect. It's close to where the walk to the top starts, and just a couple of steps outside the house you'll have a small, secluded beach where we spent some time every day.
Can highly recommend this place!