This was our second time in the Cyclades and our first visit to Sifnos. We knew very little of the small towns on Sifnos and their relationship to beaches, etc. In retrospect, after our excellent stay at Maria's place, we believe Kastro is THE place to be when you visit Sifnos. And Maria's place is one of the few great places to stay in Kastro. A quaint little apartment right in Kastro, you'll enjoy stunning sunrises and close proximity to some of the best food on Sifnos (To Astro is a few doors down) as well as some small shops.
During the day, tourists roam by your door as they explore Kastro. At night, it is peaceful and quiet with friendly locals chatting in the twilight. Need to get a little more nightlife? Appollonia is a quick drive or slightly longer walk up the hill. Heading to the beaches? You're central to drive off to beaches north or south. Bus service comes to Kastro just below Maria's place. Some notes: 1. There is a washing machine (a blessing for longer stays). 2. The stairs to the loft bedroom are quite narrow and could be challenging for those who are not agile. 3. Green travelers: Once you buy a couple bottles of water, you can refill them for 20 cents in the parking lot next to the ACS in Apollonia. We loved the ability to reuse our containers.
Overall, we highly recommend staying at Maria's place. Maria is an exceptionally attentive host (we had a slight medical emergency and she was able to immediately connect us with appropriate care). Take advantage of Maria's great knowledge of Sifnos-it will enrich your stay as you enjoy her place. Thank you, Maria!