To start, Sunny Home is truly located in the hub of Athens. Just downstairs is a plethora of restaurants, cafes, market stalls, and more. Anything you're craving or wishing to buy is quite literally at an arms reach. While the central location does add a bit of noise at night, it wasn't anything that bothered us much.
Additionally, the main attraction of the city, the Acropolis, is a pleasant ~20 minutes walk away. We also found no problem walking to the Acropolis museum, the National Archeological museum, the Old Agora etc. No taxis or additional metro transfers needed, though a metro station is quite literally across the street from Sunny home should you want to go further out.
Finally, Thomas was an excellent host. On the day of check in he sent detailed instructions (pictures included) of how to get into the unit. The entire process was simple and hassle free. Additionally, he was kind enough to drive all the way to the unit to help with clarifying opening the front door. Although we didn't have the time to extend beyond Athens itself, he also offered to setup tours, busses, and transportation to day trips outside of Athens.
All in all it was a wonderful stay. Athens is truly a cultural playground and Sunny Home was our base.