Breathtaking Acropolis view!

Stay in the very heart of modern and historical Athens, in a newly renovated luxury villa of 190sq.m! Live the ultimate Athenian experience in this ideal location for travelers who want to relax but also explore the city and feel its vibe. Book a combined stay, in Athens and Kythnos villas and get exclusive offers!


Sun salutations facing the Aegean.

K4 Kastellas is the kind of place where yoga finds its pure essence. The calmness and the serenity of the location provides an idyllic environment for yoga and meditation sessions. Yoga in the sunset can be a daily ritual of pure joy. Stay tuned for news on upcoming yoga retreats at K4 Kastellas!

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Photo sessions!

Enjoy the island and bring your memories back in the form of photographs. Leave the photographing to us, enjoy the experience and we will capture the vacation moments you'll never want to forget!

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  • “ We had an amazing stay in Horizon 1. Great place, magnificient view. Villa with swimming pool looking over the sea! Enough space to relax, eat, enjoy the view... Kind people, nice rooms with A/C. Kythnos is a beautiful island ”
    caty_ds Brussels, Belgium
  • “ Nikos, the administrator of the villa, was extremely nice, friendly and flexible with times and rules. The place is a-ma-zing! Beautifully decorated with unique details all over the house. Complete infrastructure, including a washer and dryer, but the lovely charm of a bed and breakfast! The beautiful view for the bay can be enjoyed from the breakfast area outside the house, a covered patio with bar-b-q and wood oven. Total privacy, lovely neighborhood and perfect location, just 5 minutes from the best restaurant of the island I totally loved this place and wish I could live there :) [review for Sun4 villa] ”
  • “ I had an amazing perfect stay at K4 Kythnos for our Yoga retreat! Location above the sea is simply breathtaking, the villas designed with a lot of taste, the staff lovely and fresh food delightful.I would definitely recommand this place and looking forward to coming back in August for a week of holiday with some friends. Thank you K4! ”
    Marine_MirzYoga Paris, France
  • “ We stayed in Ocean 2 for 10 days in September. Nikos met us at the house and showed us round and told us about the island. The house is very clean and well equipped and decorated in a modern style. There are good views from the house of the hills and sea. There were some local specialies in the fridge to enjoy. Everything was perfect and we would happily return.”
    BarnabySpendour2 London, UK