Just PERFECT.
Location - 3 minites from the metro line which goes to the airport; 10 meters from one of the main shopping streets, close to restaurants, bars, etc., but still it's very quiet. Main historic sites are at walking distance.
Cleanliness and comfort - it was perfectly clean and you sleep like a baby on a very comfortable beds. There is one pull-out sofa, so it could accommodates 7 people (as in our case). You can find everything you need in the kitchen if you want to prepare a fresh fish (bought directly from the fishermen). You have linens, towels (a lot), iron, washing mashine... Everything you need even for a longer stay.
Alexi and Antonis are very helpful, you receive every instruction you need way in advance; they also allowed us to leave our luggage earlier than the check-in time (really appreciate that) and
recommended to us couple of places, which are really good (but I would say that it's better to book a table in bar Noel if you don't want to wait).
Whoever stays there won't regret it.