In reply to GridNorth:
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Hey got back from a 3 week trip from kalymnos like a week ago. If it's windy they're not as bad, didn't use the the plugins we bought as wanted to keep the windows shut at night. And during the day, we were out...
Get a room with air con (though we used ours less and less towards to end of the trip), keep the doors and windows shut as much as possible especially around dawn and dusk as that's when they're most active. They bite you when you're asleep.
The only way I found to go completely bite free, is to kill every single one of them in the apartment before bed. My gf spotted them I squished them. As long as you're quick in and out at night there shouldn't be too many. Most we got was about 12 but usually theres 2-5. One single mosquito may bite you 1-4 times in a row looking for the blood, so its important to look everywhere. They like to rest of walls, ceilings, curtains, tiles. They only really fly when they're coming for you, or you disturb them.