Ive uses sunshine many times but had a problem last year , booked the Manas Park in Oludeniz and a few days before we were due to go we heard it was shut from a facebook post, contacted sunshine who knew nothing of this and said as far as they were aware there was no problem. I managed to find out who the actual booking agent was and contacted them directly, they presumed I was from sunshine and confirmed it was shut.
Went back to sunshine who did little to help just claiming they had heard nothing , In the end we got a place in another hotel in Oludeniz but not until the day we flew out. Luckily we were in Dalyan for a couple of days first.
Sunshine are cheap and I would use them again but they are only a 3rd party website and are poor at helping if there are any problems.