We went there twice a few years ago and loved it. It was in June though.
Marti Hotel has lovely grounds and two swimming pools, it also has it's own stretch of private beach which is kept spotless, pool and beach towels are provided.
I There was not a lot of entertainment at night in the hotel but we used to wander around the town. Icmeler is a nice resort with friendly people everywhere, we have been 9 times so you can say we like it.
If you have got a good deal, go for it as this hotel is pretty expensive normally.
Not sure what the weather is like in April but I amsure someone out there will know!
Barb