I've been to many places via Airbnb and this was one of my best experiences!
We were three adults, one baby and a toddler and stayed at Harmonia House in the middle of October.
THE HOUSE
Wow. It's clean, spacious and everything you need is there (especially in the kitchen). And if you feel ike anything is missing, the host family is ready to help. Nice extras: welcome snacks (water and fruit), windows with moscito nets, a small safe, fresh peppermint in the garden of the veranda, a good stack of coffee/espresso and tea is available in the kitchen.
THE LOCATION
Great spot! The house is located in a small street - but you will hear moto bikes roar by. It's close to everything you need. The bus stop is a 5 minute walk away and there's a big super market almost around the corner. The beach promenade with shops and restaurants is not even 10 mins away by foot. I was surprised by the good quality of some of the restaurant there (often I found restaurant at the beach promenades to be "tourist traps" with disappointing food for high prices - not here in Kamari! :))
THE HOSTS
The best! Always available, quick feedback and just wonderful people. We got help with our airport transfer, a late check out,...Maria noticed the dirty baby- and kids clothes and offered to wash all of it - including the clothes of all adults. Every now and then we would find a nice homemade dish on our kitchen table...hmmm. :)
Me and my family can highly recommend Harmonia House! Have a great stay in Santorini!