The Captain's flat is a very beautiful, sunny, bright place that sits in a more quiet neighborhood near the Syntagma square. The nearest metro station is Victoria.
The apartment has two large bedrooms, very comfortable double beds, both with lovely balconies that get the sun all day - and great views, at that - (both have blinders, though). There is also a large terrace to the other side of the building which, in early spring, made for a lovely dining room.
The kitchen and the bathroom have most everything you might need (just always make sure you close the fridge door and you are good to go) - and everything was sparkling clean when we arrived.
Hosts are super friendly and communicative - they arranged an earlier check-in on a very short notice, too.
Just keep in mind that the lift can handle 2 persons (150 kg) at a time and for larger groups some of you might have to take the staircase to the 6th floor.
All in all, I would recommend the place and hope you have a lovely stay!