My wife and I stayed at Wassim's place for close to three weeks. The neighborhood is quite safe, there is a grocery store across the street, an amazing souvlaki place around the corner, it's a 5 minute walk to the metro, and a 20 minute walk to the Parthenon. Yes, there is a tiny bit of construction noise due to the building next door (as others have commented) - but we only noticed it twice, and both times it was about 9am...so literally no bother at all. Wassim was extremely easy to reach, and was quite friendly. He made a point to proactively reach out multiple times to make sure that everything was going well for us. Absolutely recommend staying here in Athens - I know that we will certainly be back.