I extended a business trip in Athens with my wife and we stayed at Theodore's Apartment in the Sky. Theodore was a fantastic host, he thought of everything in the apartment and all the directions were very clear. He had a packet of information with everything you might have questions about and suggestions of things to see in the city. Upon arrival he was out of town so we were actually greeted by his enthusiastic mother. She was very sweet and helped us settle in. The apartment is a little tight, but I would not say it is too small. There is ample closet space and the kitchen is not cramped. There is a wonderful balcony where you can enjoy the city view, have a drink, or eat dinner. Internet was fast. We felt very safe in the apartment and the surrounding area. There was a grocery store just across the street that we did some shopping at and the apartment is not that far of a walk to get into the city, or there is a metro stop about a minute away.
We were only in town for a few days so we tried to see as much as we could. Based on Theodore's advice, we went to Lukumades which had fantastic Greek donuts, and Tailor Made a very hip coffee spot by day, cocktail bar by night. We also found an eccentrically decorated tea house called Little Kook which was packed with locals. We had wine and Ouzo at a very old looking bar called Brettos. As for visiting the Acropolis, we decided to hire a personal tour guide. It was 100 EUR in low season and we found it to be an excellent experience. The lady was super knowledgeable and friendly and now we know a lot more historical and current details that we wouldn't have known otherwise.
When it came time to leave we hired an Uber to drive us to the airport, total cost was 22 EUR and around 40 minute drive. With luggage this seemed the best decision.
I highly recommend Theodore's Apartment in the Sky to anyone planning to visit Athens!