Love Batak lake , very suggestive light and weather. It must be very therapeutic see as the panorama change day by day...hour by hour.
On the road for Dospat there are also other stunning smaller mountain lakes,cold even in july.
About the cities...Dospat and Batak...they are not very appealing. In the long and cold winter months they must be a nightmare... Dospat has roads with 40% inclination. Waiting for the traffic lights to turn green while on that inclination is not what I would do in daily basi...leave alone in the winter with snow and ice.