This beach house hosted by Jannis is an outstanding option for your stay on Santorini for several reasons.
First, staying on Kamari Beach is absolutely the correct way to go about visiting the island. The bus system is incredibly simple to navigate (pay a few Euro once you get on the bus for your "ticket") so you can easily and quickly visit the more notable villages on the island like Oia and Fira. But those cities lack a lot of island life experience – they are up on the Western cliffside, they are more densely populated, and don't have that much to do within the city itself other than wait all day for the beautiful evening sunsets. Staying in one of those cities will likely see you leaving them for the day most days....to go to places like Kamari Beach. Just stay on Kamari Beach and your problems are solved. Kamari Beach has chairs/umbrellas for public use – you pay a few Euro to use them each day, or if you eat at one of the beachside restaurants they will let you use one of the ones in front of their restaurant for free.
Second, Jannis is a local (lived almost all of his life on the island) and knows a lot about Santorini. If you are interested in actually connecting to the cultural lifeblood of the island, learning about the people, places, and experiences, Jannis is a very friendly conversationalist and will make your stay a richer experience!
Third, the home is really terrific. The place Jannis owns is actually several small apartments/AirBnB rooms all on the same property, so just know that you will likely be crossing paths with other guests. If you are a social traveler and enjoy meeting people from other countries and cultures, this place is a cool melting pot. We never felt like we didn't have enough privacy, there was no disruptive noise or anything like that, but it is important to know that it isn't just you on the property. The room we stayed in was exactly what we needed for two people – a small kitchenette, a bathroom, and a bedroom. We spent pretty much the whole day out on the beach or visiting nearby villages on Santorini, so the home base was simple and perfect for our needs. The property is gorgeous with a wonderful yard, flowers, and some places to sit/rest/relax/east outside. It is probably 50 yards from Kamari Beach, so it is a quick jaunt if you need to come back to the home to grab something. The area around the property is beautiful, quiet, close to the bus stop and Kamari which has all kinds of restaurants, bakeries, etc.
Highly recommend – this was the ideal place for our honeymoon on the island and we fell in love with Santorini in an instant!