We had an amazing time staying at Efi's place. As a disclaimer, we went to Syros for work reasons, but of course we wanted leisure time as well. The apartment has everything to offer. It's quite spacious, has a well equipped kitchen and enough space to comfortably work on our notebooks. A friend/colleague of mine staying with us was really thrilled with all the streaming possibilities in the smart TV (there were a few important games these weeks).
There are several ways to reach Efi's place from the main square. The fastest one brings you there in only 3 minutes, at the cost of climbing 155 steps. A slightly longer one takes you by a nice church and requires mere 22 steps. The perk of the height is the amazing view you get from both balconies as you can see from the pictures in the listing. The upstairs balcony has enough space to comfortably accommodate everyone for a nice evening meal.
The house is located only a few minutes on foot to the best swimming area in Ermoupoli.
We stayed 12 days at Efi's and during this time she came by twice to do some cleaning, which was impeccable. The house is really well kept.
Efi is a very nice host and you won't find any hotel with better views and amenities than at her place. I highly recommend it.