Turning off the DJ113 to the minor road up to the lake, this is a beautiful road in a scenic tourist area. Road surface on this section is much better than the DJ113, the road flows nicely and some very nice curves. The last section is a toll down to the lake itself. You can walk the last bit if you prefer not to pay, in the attached video I rode the complete route.
Beautiful surroundings take you up to the only volcanic lake in Europe where you can take your own mineral water, lake is very peaceful. You can park at the top of the hill and walk down about 1.5kms to the lake or pay a couple of Euros and drive down to within 100 metres of the lake. Road is very twisty and nice but also (unsurprisingly) popular with tourists so peak times may not be the best time to go.