The apartment is close to Syntagma as described and it is so convenient to reach any popular sightseeing places in Athens. The check-in process was simple and efficient. We are a travelling group of 7 people (including a baby). 2 people have to sleep in the living room, which is less comfortable than the others since there are some noises (from the engine of the vehicles) from the street from time to time at night. I assume that 4 people would have the best experience, considering also that there is only one bathroom.
Everything else was perfect. The first day we forgot to bring out the key. The manager helped us out quickly. Toni was also responding rapidly. I warmly recommend this apartment for the tourists in Athens.