I am a long-time traveler to Athens, having lived and worked in Greece off and on for several decades. This is a great place for people traveling as a couple or as a single person. Extremely convenient to the Metro's blue line, you are minutes away from the Plaka/city center (actually, it's an easy 20-minute stroll), yet in a quiet, 'normal' neighborhood with amazing kafeneia and tavernes in close proximity. You are strategically poised for good food and company, whether you turn right or left from the front door. My favorite plateia and kafeneia are seconds away from Vaitsa's apartment.
The apartment is in excellent condition, and the owners are extremely helpful in describing the check-in/check-out procedures, and in offering assistance to both get to the apartment and to leave/transfer to the next stage of the adventure.
Highly recommended for the single traveler or couple.