We had an excellent stay in Athens. The view of the Acropolis is incredible, day and night. The location of the apartment is perfect, you are right in the center of the city, everything is 5-10 minutes walk away, it's perfect to discover the city. I recommend the accommodation of Romanos, who is very responsive and friendly. We will come back with pleasure!
For the noise as indicated in other comments, you are in the center of the city, there is noise on the terrace the night but by closing the windows, no problem to sleep. Everything was perfect (maybe just review some of the slightly outdated equipment inside).