I had a wonderful time in my stay in Monastiraki. The location is perfect to walk all over the city. Great bars and cafes are all nearby as well as all the major sites. The apartment was extremely clean and well equipped and was a perfect haven away from the bustle in the streets below. It is in the heart of Athens so be prepared for some late night/early morning club noise. For me that added to the charm of knowing you were in a vibrant city.