I couldn't want more from Nikos' place. First of all, for me, the spot is excellent. It is in the heart of Exarchia and the balconies give on the plateia, which for me was an awesome place to chill and have a beer.
The appartment is exactly (if not better) as described and seen. Very big, with everything you need, from the oven to the dishwasher and the washing machine. The aircon is a must for these hot summer days.
Nikos (as well as his mother) are very welcoming and helpful hosts. If you consider going to Athens and want to be in (IMO) the best neighborhood in the town, don't hesitate to go to Nikos'. Don't be scared of what you may hear about the area: it is lively. Yes it is very political. But what's not to love?
Ευχαριστω πολυ Νικος ! Γεια!