I really enjoyed staying at Konstantina's place. Konstantina and her partner are very quick to communicate with and the apartment is clean, beds and towels set up like a hotel and a large space. I would say it would be easily comfortable for 3 or 4 people. The neighbourhood has lots of restaurants and cafes and places to hang out and it is an easy 20 minutes walk into central Athens as well as a 5 minute walk to the nearest Metro. I've tried hard to think of a problem, the only things I can think of is in Greece you need to plan for when you need a bath or shower as you need to turn the water heater on and wait 20 minutes or so but you soon get into the habit of it.