Nikos was an excellent host. As soon as my booking was confirmed Nikos contacted me immediately providing me with all the information required for my first visit to Athens. Unfortunately Nikos was not able to greet me on the day of arrival as he was at his holiday house. Nikos organised his house cleaner to wait for me. The following day Nikos sent me a message asking if I was okay and if I was available he could come greet me personally. I messaged Nikos at about 4.30pm the following day and he was there within minutes. Nikos was kind enough to take me out for a coffee knowing I was a solo female traveller.
You cannot ask for a better location. I love walking and you can also walk to most of the main attractions from Nikos's apartment. I also felt very safe in that location. There were parts of Athens that I would not walk alone in the evening and if you're a solo traveller I would recommend staying at Nikos's apartment.
One minor thing was the noise because I am a light sleeper. I'm not sure whether it's common for the apartments in Athens but it's not very sound proof as i could hear people coming in and out of the apartment building. It's not a huge deal if you get some earplugs which I did the following day and I was able to sleep through the night. There are various pharmacies close by and the earplugs are dirt cheap (.60 euros).
All in all, I had a very pleasant stay for my first time in Athens.