The apartment is a great solution for one night if you need to be close to the port. In Ermoupoli many accommodations are un the hill with many stairs so this is rather a good spot for being near the port. We stayed there from the afternoon until early morning when we took the ferry from the port, and it was amazing to be within 4 minutes walking distance even with suitcases.
The apartment is new and nicely renovated . It is located on the street level, so you basically open the door from the sidewalk and enter the living room. It has an upper gallery that serves as a bedroom and the street level living room, a well equipped kitchen, TV and a new great bathroom. However there is only one window in the apartment and I suspect it is a bit dark during the daytime. The window that opens to the street itself and we find it problematic since there is not much privacy, we had no problem since we came in the late afternoon, and closed the shutters and slept through the night, and left at 6 AM. If you close the window during the daytime, there is no natural light or ventilation, only AC. During the night there are some street noises and music but they didn't last until very late.
Despina was an amazing host. She was available on WhatsApp, She took care of everything we needed, even an extra bed for the children. She also allowed us to keep the luggage while they were preparing the apt. and also came down to say goodbye when we left for the ferry early morning. Efcharisto poly, Despina.