We stayed in Thelma's apartment for 2 nights. The apartment is really great and very nice furnished. It is actually better looking in reality then in pictures. Most important, it was very clean.
The metro is near, about 5 min walking and you can go to the center in 15min. If not, you can take the taxi - about 6-8 euro from the center.
We really enjoyed staying at Thelma's, she was a great host and she understood our needs. I truly recommend her as a host, because she was very easy to communicate and very friendly.
If we ever come to Athens again, definitely we'll choose Thelma and her beautiful place.