I stayed at Manolis' studio apartment with a friend for a few days in late June. We found it to be an excellent location - 1 minute from Perivolos beach - the famous volcanic 'sand' beach in Santorini. On this beach, there were plenty of bars and restaurants and many of them offered sunbeds if you just had a coffee or a drink from there. We particularly liked a simple cafe called 'Margarita' where it seemed to be family-run and very friendly.
In terms of Manolis' studio apartments, it was great - good size, small kitchenette to prepare simple breakfast or lunch. Also, there are a few nice places to sit outside and relax and enjoy the atmosphere. We were also pleasantly surprised that the room was cleaned every day for us.
In terms of the location of Perivolos to other places on the island, it was also very good. We were able to get a bus to Fira and Oia (great to visit for the scenery and the views but one visit was enough for us as there are a lot of tourists in those places in comparison to Perivolos!). Also, it's not far from the port - about 20 minutes with a direct taxi which Manolis kindly organised for our return.
Finally, as a host, Manolis is lovely. He communicated well from the start and was good at using WhatsApp with me even during our stay when I had questions to ask. He was very helpful and even took me to find out information about ferry tickets to leave Santorini.
Overall, I would really recommend staying at Manolis' place and in Perivolos if you want a relaxing time at the beach with friendly people. Don't forget to take beach shoes though as that black volcanic 'sand' gets very hot on the feet!