Timmi's place is very cool - used to be her office as an interior designer and the walls are hung with photos and sketches of her work, and there's lots of magazines and design books to look through on a quiet day.
The area is nice - used to be the fanciest part of town in the sixties. The shops on 28th October St look unassuming but the shopping is actually decent. We found a couple of good restaurants and its a few minutes walk from Au Revoir, apparently Athens' oldest bar.
Plenty of good supermarkets and bakeries around although I'm not sure if that's special for Athens.
We like walking so we got on well with the 40 mins or so to the centre (Acropolis etc) but buses to the centre leave very regularly from round the corner. It's also more like 15 minutes to the archaeology museum.
You won't have an easy time if you're planning to cook any elaborate meals, but a cooked breakfast is very manageable and there's a good coffee maker and lots of fridge space.