We really enjoyed our stay at Sofia's place which is located near the metro line that brings you to Syntagma or the airport. The highlight is definitely the spacious balcony! But a downside is the tiny bathroom / shower and if you switch off the air conditioner it gets quite hot at night.
The flat is located in a good neighborhood with restaurants and cafés. Sofia answered quickly and although we didn't meet her in person she had some good tips for us! Unfortunately there is no space to leave the luggage after checkout but there are lockers available in the city.
We would definitely recommend this apartment!