Lefteris is probably the nicest guys in all of Athens!
We stayed at his place for (unfortunately) only one night on September, 2013, and had a great time!

We arrived at Athens in an unusual time (23:30 on a Saturday night), yet Lefteris was available to welcome us very kindly, and help us with all our needs. He had a bottle of home made Raki in the fridge just for us, offered us dinner, and even to take us on a tour in the city the next morning. He also sat with us for about an hour, and helped us to plan our vacation in Greece.

The apartment itself is really lovely! there are two double beds (1 of which is hung up in the air in the living room, so only if you're not afraid of heights), and the other one is in the bedroom, next to a single, smaller bed (total of 3 beds for 5 persons)
There is also a wonderful big balcony, where you can have your morning coffee or evening drink.
The kitchen is well equipped, we didn't plan to use it, but just ask Lefteris, I'm sure that he won't have any problem with that.

There is one bathroom/toilet next the bedroom (the toilet is actually "inside" the shower, so they can't be used together), and one more toilet in a small cabin outside on the balcony.

highly recommended for a long/short term stay!