The Foundry suite is just at the west end of the Psiri district, one of the liveliest in the city with a mix of tourists and Athenians, plenty of bars and restaurants every 10 meters.
https://www.thisisathens.org/neighbourhoods/monastiraki-psirri-guide
Right next to the Foundry there is a grocery store "Athenian Deli" which also serves as a restaurant (in the basement) and where you can also have sandwiches or snacks.
For lunch, go to the Central Municipal Market, it's a 10-minute walk.
https://maps.app.goo.gl/E4Kf3yohLHAxk2aCA
There are restaurants in the outer aisles of the market, try Aris Tavern or Oinomageireio Epirus
Aris is on the north side of the market (Sofokleous street side)
Oinomageireio Epirus is on the south side (Evripidou street side)
For an evening drink after dinner check out the Tarzan Bar, down the street
https://maps.app.goo.gl/SrBL6doH6tRpm7nd8
Since you are talking about "drive", I hope you do not intend to drive a car in Athens!