We enjoyed our stay here. Vasileios is a great host and was very hospitable. The apartment was very nice for our group of three people. As noted, there are two bedrooms, a living room that is divided so that there is a separate large office area (with another sofa as well as a desk that is convenient to set up to use a laptop), and a small kitchen. It is nice that there is a balcony and that there are two toilets.
We initially chose the location because it is close to the Metro (8-minute walk per Google maps) and close to the X95 bus station (that is open 24-hours a day and goes to and from the airport for a low price), though we ended up just taking a taxi. Vasileios was kind enough to offer to pick us up from the bus station if we did decide to use that option. We took a taxi (which, of note, is 38 Euros (fixed rate) between 5 am and midnight and 54 Euros during the other hours). Vasileios met us at the apartment when we arrived and when we left, even though it was early in the morning. He was also nice enough to offer to stop by on his way from work during our stay to answer some questions. He was very hospitable and friendly.
The locations is an approximately 10-minute taxi ride to the Acropolis Museum (across the street from the Acropolis) according to Google maps, and is a closer distance to several other locations. You can also walk to the Metro, then take the Metro to the Acropolis. It is ~ a 10-min walk to the Panathenaic Stadium, which is across the street from the National Gardens. There is Hop-On Hop-Off bus stop right across the street from that stadium. We actually did not end up doing that tour, but it seems like a nice option.
The apartment's location was conveniently very near markets (there was even one right downstairs), so you can buy some food. We did not have time to explore the area more, but it seemed like a nice neighborhood.