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I did, yes :)
I have a question: I checked the map and I saw this place is in the south. Is it easy to arrive here with bus and train? From Sofia, for example?
Also, I have to come back to Istanbul sooner or later.
Do you know if it's possible to go to Istanbul from here?
I would like to include this seaplace in a future road trip :)

In the summer season, it is easier to make this trip, as the buses to Sinemorets are much less frequent during this season.
From Sofia you can travel to the city of Burgas by bus or train. From Burgas you will catch a bus to Sinemorets and you are there.
For traveling from Sinemorets to Istanbul, I guess there will be a bus, but during the summer season.