A little paradise. In theory, I could have stayed in Myrsini's apartment 24 hours everyday without going out and would still have a lovely time in Athens (and I could see the Acropolis from the balcony anyway). Just like the host, this place is simply lovely. It's spacious, bright and cosy, complete with lots of elegant touches. It's got everything you need for a comfortable stay, and the building has a cool lift.
The building is just a short distance from the central train station. We walked all the way from home to the Acropolis (about half an hour) but one can easily take the metro nearby. There's a vibrant open-air food market downstairs (it doesn't open everyday though) and also a super nice seafood restaurant downstairs - down-to-earth with nondescript decor but the lovely chef serves good seafood dishes at more than reasonable prices.
In sum, we had a great time in Athens partly because of this apartment. Thanks Myrsini !