We had a wonderful stay at Nicholas' place. It was perfect for a family with young kids. The appartment is huuuuge, obviously very recently renovated and we really liked its style and design. We even could enjoy a coffee on the wide terrace despite being in February (added bonus: the view on the Acropolis). Perfect location in Kolonaki: 15-20mn walk to the Acropolis, 5mn to Lykabettus hill and to very good museums (Benaki, Cycladic art, etc...), plenty of good restaurants nearby. Highly recommended!