Good afternoon!

We will be traveling with a 1 year old next summer therefore we would like to spend our holidays in a resort in Halkidiki area, close to
Thessaloniki Airport (max. 100 km far). Could you recommend a quiet place but which still has supermarket and a few places to eat out, and offer accommodation in apartments or a small house to rent?
It is a must that the beach is clean and not too crowded and with gradual entrance in the sea..
Thank you in advance.