The apartment is exactly as on the pictures. Everything was clean and looked very new.
Giannis was super kind and friendly. He replied quickly to my messages and he met me for my check-in even though I arrived late in the evening.
Myrtia is great village to relax. It's very quiet, one can enjoy nice views and the Nikos Kazantzakis museum is definitely worth a visit. It's also possible to hike nearby, although I didn't do that because of an injury.
The only thing is that it's kind of difficult to get there without a car. Apparently there is one bus from Heraklion and one from Myrtia to Heraklion, but not on weekends. So it might be more enjoyable if you rent a car, otherwise you would have to take a taxi, which costs around 25-30€ for a single trip.
But all in all, it was a very pleasant stay. I can highly recommend Giannis' apartment and the village of Myrtia.