This is a great budget stay in the best location of Athens. You are minutes away from everything from the Acropolis to great restaurants and bars, not to mention all metro lines.
The apartment is stylish, clean, and well-stocked. It is spacious for 2 people, but would be quite a tight fit for 4 since the other bed is just a sofa bed that takes up most of the living room. The host leaves many blankets and extra linens which are great for feeling cozy.
The neighborhood can get noisy at night and the walls are quite thin so you hear most of what is around you, from neighbors to those partying outside to construction in the morning, so if you are a very light sleeper you may have trouble.