I stayed a few times in Movenpick Ankara and I really enjoyed each of my stays. The staff is extremely friendly and helpful. The room is perfect in terms of size, comfort and silence and there is a bathtub in the bathroom which in Turkey is luxury.
The room's decor is a bit 70's but I did not mind at all.
Also, the restaurant downstairs is very, very good (for business lunches) and not too expensive. The breakfast is also great with a lot of choice.
I have not tried other hotels in Ankara since I liked it so much. The location is also very convenient.