Yes, it is. So do I am planning to climb it (in August).
When I took the picture, I was doing nothing more than watching a glacier-wander course, as a guest, so I had no partner, and the weather and snow conditions were not stable enough to say the least.
As I could see from Forno glacier, the middle glacier could be about 45-50° steep, so it wouldn't be impossible... :)
We had our camp on Forno glacier, just below Valbona glacier. So we didn't visit the refuge.
We had big backpacks so on the first day we just went up until the dam house (where there is a small bivouac room) in about 2 hours, and on the next morning up to the glacier, also about 2 hours. If you have less stuff and are in a good shape, you can reach the hut in 4-5 hours.