We had a great time in Kelly's flat! Highlight: The roof terrace with a spectacular view of the Acropolis by night.
The flat is very clean and lacks nothing. You can find everything you need in kitchen and bathroom and also additional blankets if you are rather someone who freezes at night - we were there in March and it was pretty cold at night so blankets were very welcome.
The flat is situated in a lively area with many restaurants and bars (note: this means that it's not a quiet neighborhood including car and moped traffic during the night but this is the case in many parts of Athens) and some nice stores where you can buy gifts etc. Sights are easy to reach by foot.
Kelly and Marina are very hospitable and helpful and they did everything to make our stay successfully. Thanks to both of you!