Ephesus is the Western Anatolian civilization and the stunning natural paradise is located in the western part of Asia Minor, also called Anatolia, which is now part of the Republic of Turkey. E 'near the historic town of Selcuk (Seljuk) between the cities of Aydin and Izmir (Smyrna). It is 6 km. from the Aegean Sea and 680 km. Istanbul, 55 km. by Aydin, 225 km. from Denizli (Hierapolis), 180 km. from Bodrum, 205 km. from Marmaris and 510 km. Antalya.
The Terrace Houses were probably my favourite part of Ephesus. Definitely worth the added expense. I have never been to Sirince Village though.
I don't know anything about Hello Ephesus, but I can HIGHLY recommend Ekol Travel. It was a private tour and very reasonably priced. We were met at the terminal by our guide with a sign with our name on it. The day was catered entirely to our interests and the tour guide (his name was Emre) and the driver were very knowledgable, fun and accommodating. Honestly, I can't say enough good things.
Regardless, you will have a fantastic time at Ephesus. Of all the places in the Mediterranean I have been, it is one of my favourites.