Staying at Maria's apartment was an enjoyable experience. Maria and her friends/family that help her run the apartment were all super friendly in ensuring we had everything we needed for the stay. We took up their offer to get a ride to and from the airport for a fee which helped us out a lot.
The apartment is a little on the cozy side but has some modern furniture and is very clean. The bed mattresses are pretty firm but for the value of the apartment I would say its ok. I would say the bathroom is pretty small but manageable and the beds being firm are the 2 things that could be troublesome to some people. It was fine for us.
The apartment is located near both the M3 and M1 train lines within a 10 minute walk of both. It is a little outside of the main touristy area that is near Acropolis. Its in a more quiet area which is great if you want a quiet area and are willing to walk 10 to 15 minutes to the nearby area for restaurants and shops. I definitely recommend the apartment!