Reserve it immediately!
This place truly is one of the hidden gems of Athens. It is even more stunning in person, completely renovated and providing anything a weary traveller or two might need. It's hidden just under the Philopappos Hill and provides a great hiking point should you choose to ascend and offers a great variety of shops and restaurants nearby (but not only those mass food factories aimed at tourists, that the centre has, but genuine Greek food in places that locals come to visit), it offers you a much better and more genuine experience of Athens, while still being in the centre, compared to lodging in a hostel in the midst of the touristic hotels.
The place itself truly is gorgeous, newly renovated with full amenities and a lot of thoughtful touches. The bathroom is stylish, the kitchen leaves you missing nothing and the bed is wonderfully comfortable.
Maria (the host) herself is just as great as her place - welcoming, full of helpful tips and striving to accommodate any wishes one might have. Thank you again for everything, it really has been a pleasure! I've stayed at this place for the 2nd time now and I'll be sure to stay here again the next time I find myself in Athens!
Long story short: 5/5 in all aspects