We (a group of 5 adults) stayed in the Sunset View villa for a week in mid-September. The villa is exactly as advertised, with plenty of room for all of us. The views from the upper balcony are excellent, and we spent quite a bit of time up there, including enjoying a few of Santorini's famous sunsets.
The location is Firostefani, which is a smaller town between Fira (the main tourist town) and Imerovigli. There is a small town centre about 200 metres from the villa, with restaurants, small supermarkets, etc. There is a cafe (good coffee!) immediately beside the villa, and quite a good restaurant next door to that. Both Fira and Imerovigli are only about 15 minutes' walk away. It turned out to be a good position, because even this late in the season, we had up to four big cruise ships in the harbour, and so the streets of Fira could be quite crowded, so we were glad that we weren't staying in Fira proper.
Eleni V and Mrs Vanda organised everything for us, including transfers to/from the airport. Mrs Vanda also provided us with a lot of useful information about the island, and was available whenever we needed her, even leaving us with a local mobile phone with her phone number already programmed in!
All in all, it was a wonderful holiday. Santorini iteslf is great, and we really couldn't have asked for a better place to stay while we were there.