We put up at Euphoria Suites for 5 nights, the entire time that we were at Santorini and it was awesome! It is within walking distance from Fira Center (5 mins) and around 10 mins to the Fira Bus Station, which was very convenient for us when traveling to Oia and the other towns!
Alex was also very helpful in helping us book the tours (we took the Caldera Tour) and in renting a car for us to get ourselves to the airport early in the morning.
The room was made every day too, so you can be guaranteed to have fresh towels and clean sheets after a very tiring day out exploring. It really made us feel right at home, which was probably the best part about this place.
The only thing that one needs to consider is that as the apartment is not at the edge, you will not get the caldera view like if you were to stay in Oia. But this is made very clear in their pictures, and all the pictures and description were accurate. So if you are ok with that like we were, it's all good! Overall, a superbly pleasant stay - also mainly because we were away from the hordes of people and tour groups which we liked :)
Thanks Alex and Christi for the hospitality and incredible stay!