Michalia was super helpful in communicating before we arrived. There was someone at the flat there to great us at the time we arranged. The flat is very spacious, and was very comfortable for our family of 6. There are two full bedrooms and one sofa bed which was fine for kids to sleep on. The kitchen is fully stocked and we happily cooked a few meals at home. The neighbourhood is great - there is everything you need within walking distance, a grocery store with long hours, pharmacy, bakery, cafes, shops etc. We were really happy with the flat, I would only warn that a few nights it was a bit noisy (traffic) from the outer bedroom, but you are in the middle of the city so I don't think that is a fault of the flat per se. We really liked staying in the Kolonaki area as opposed to other areas closer to the historical sights, we felt like we experienced a little slice of Athens life as opposed to living in a tourist-only area.