I would recommend a stay at Konstantinos flat with all my heart. I was living there for one and a half month while working remotely.
It's functionally designed and well equipped. The bed is big and comfortable, but I'd say that the additional place to sleep on the couch is suitable for one person, not two. The balcony has nice view, you can easily protect the inside of the flat from the sun. There's also a small garden in the back. Generally the neighbourhood is not flooded by tourists, Greek families are living in that part of town.
You can reach the city center by bus (hovewer its timetable was sometimes unpredictable for me :)), you can also take a 30-40 minutes walk. 7 minutes from the flat there's a place to swim - a natural, rocky pool.
In terms of working remotely, the internet connection was good, we could easily have two videocalls at once.
And last but not least, the hosts are very helpful and friendly, and sometimes they're giving you a homemade greek food <3