Christina's place is fantastically located (Pangrati). It is in a very happening and lively neighbourhood, gardens, cafe's, bars, restaurants, shopping etc. You can walk to central Athens in about 20mins (to Syntagma square) and the touristy bits are all reachable from there on (doesn't have to go that far even). Christina is quite prompt in responding to messages, good at providing tips, and even helped me out once when I got locked out! Would recommend.