Kostantinos place was great for our family group of 6. We arrived and communication via phone was great, we found keys in the outside locker as instructed by the host. The apartment was spacious enough for 8 people, you have 4 double rooms with 4 double beds and each has it's bathroom. We found complimentary raki and fruit as apples and oranges which was well appreciated. The apartment was really clean throughout. You have aircon and a tv in each room and a balcony all around the apartment though a bit narrow in some areas. Just a few points against in my opinion :
1. The mattresses on the beds are not the greatest. I've felt a little uncomfy some nights due to springs in the mattress poking in my back
2. Wi-Fi is not great, we couldn't manage to watch anything on Netflix on the tv but I suppose that's how on the island is.
3. The shower's all have this tent around them which I don't really enjoy as even if you try you usually end up flooding the bathroom with water. We did our best to avoid that.
These are a few points of concern on an otherwise great priced property. If we would have the occasion to stay again in Heraklion we would probably go again!