Recommended places
1.) market for groceries on Parthenonos and Veikou, the great bakery by the police station on Veikou, the Makrigianni street has all the tourist restaurants and shops along side the Acropolis Museum. There was an excellent place to eat that was open 24 hrs a day just a couple of blocks south east of your place...going down Misaraliotou and left just a couple of store fronts on the main traffic street of Andrea Sygrou Avenue. I think the name was ‘TO 24 WPO’
2.) the Airport Bus leaves from the south east corner of Syntagma Square about every 15 min a low cost.
3.) I would recommend Athens by Bike at Athanasiou Diakou 16, Athina 117 42, Greece ... just a few blocks to east