I highly recommend you stay at Konstantinos apartment if you want to explore central Athens.
The apartment is in walking distance to the Acropolis and all other city sights.
This apartment is very big and roomy with a great balcony overlooking rooftops & The Acropolis.
We really enjoyed the complementary wine on the balcony late in the day after exploring the city.
The apartment was spotless and the beds are very comfortable.
We have travelled extensively and this is as good an apartment that we have stayed in anywhere.