We absolutely recommend staying at Alex&Maria's place. The apartment is spacious, with great facilities and everything you might need for a short or long stay in Athens. There are many ares to work from (including the wonderful balcony) so it’s absolutely convenient if you need to work remotely. The wifi is a bit slow though (only matters if you need to work a lot). We had the warmest welcome with a fridge packed with food just for us!
Needless to say we had a great time and felt really at home. Would definitely want to come back again!