Costa's flat is in a great location - walking distance to the main tourist areas with loads of bars and restaurants, as well as the Acropolis, but without the huge crowds of tourists you might find in another area like Plaka. The flat is simple but it is an excellent value. It's clean, the little outdoor area is great, and the neighborhood was close to other restaurants, supermarkets, and anything else we needed. We would easily stay here again.
Costa also helped to arrange a driver to take us to/from the airport, which was a huge help and time saver.