We enjoyed our stay here. The location is fantastic, and we felt safe leaving the apartment and walking around the middle-class and touristy neighbourhood. There is a public park immediately outside the front door, and while there was some noise on weekend evenings, it wasn't too loud and ended before midnight. I should also mention the AMAZINGLY EFFECTIVE air-conditioning in each room. Having stayed in European apartments without AC, this was a real blessing, even in May.
The kitchen is full-sized by European city standards, and has the utensils you need. The upstairs combo laundry/dryer unit is effective, but budget 5 hrs for a full load (again, typical for European city apartments).
We had 6 adults and a toddler in the apartment, and its high ceilings and many rooms never made our stay feel cramped. The two washrooms needed a service visit while we were there (again... typical European old buildings), but our AirBnb hosts (Esmerelda and others) were instantly responsive to every comment and request. Their replies were always cheery and polite, and when someone needed to be sent out, it happened immediately.
We found the apartment tidy and clean when we arrived, and thanks to the clear check-in instructions, were able to work around the usual quirks that one finds (e.g. having to turn on the hot water breaker before a shower - incidentally, once the boiler heats up, there's lots of good, hot water).
A literal 3 minute walk away, you will find Mentor Cafe, which serves a variety of delicious waffles for kids of all ages, along with coffees, brunches and full meals. Keep walking up that way on the pedestrian street, past many cafes and shops, and 10 minutes later you arrive at the entrance to the Acropolis. 4 minutes in the other direction gets you to a train station, Gyristroula (an inexpensive and delicious wrap/gyros/souvlaki joint), a Grigory's (a pastry and coffee chain equivalent to a Greek version of Canada's Tim Horton's) and many other restaurants and shops. You could not be better located for visiting Classical Athens.
The walk up to the apartment itself, inside the building, is fairly short (1 storey), but do note that there is no elevator. We were able to manage with one person bringing a stroller and the other carrying our 20 month-old, but be aware that the mobility-challenged may have more difficulties.
I am very glad that we found this location - we were comfortable here, and it was an excellent jumping-off point for our 10-day stay in Athens.