Markella's apartment is centrally located, it's about 10 min walk to metro station Attiki, there's also bus right in front of building, which can take you to city center as well. it will only cost 5 Euro either from Attiki station or from Syntagma station with taxi, where you can take metro blue line to airport directly. Down stairs, there's a super market, you can find everything you need to cook a meal. there're total three ACs in the apartment, if you have a large group, you don't need to worry about who should stay in which room. Markella allowed us to check in early, which is very kind. She also provided everything for guests: shampoo, soap, towels, bed sheets, hair dryer, even a instruction sheet to explain how to make Greek coffee. She went beyond and above, asked her friend to help locate my lost luggage at the airport and provided us information avoiding tourist scam. Overall, we had a wonderful stay, will definitely recommend Markella's apartment to everyone visiting Athens.