Kamares is the only harbor in Sifnos. While it provides good shelter from the meltemi (the Etesians) (the Etesians), it seems to have a constant swell, this swell is very uncomfortable and at times can be dangerous. At other times conditions are good, although a sea breeze sets into the inlet during the day and a land breeze out of it at night, so set your anchor accordingly.
Go stern-to the quay, where there is space for around 6-8 yachts. The bottom is sand and weed and sometimes the holding is not too good. Use plenty of spring lines. Alternatively anchor off in 3-5 meters. If the swell becomes too strong it is best to go to Port Vathi about 4 nM south.