. . . which will have several mod. cons.
Хижа Мусала, the Musala Hut, 2430m.
On the ordinary route from Borovets to Musala, at 2925m the highest mountain in Bulgaria, and indeed in the whole Balkan peninsula. I wasn't exactly equipped for alpinism, just walked up from the town in denims and trainers with Kahtoolas, so carrying on to the peak was not an option, though I believe it's an easy and well-marked trail, in summer anyway.
I don't know what the capacity of the Musala Hut is (it was shut) but it must get busy in summer, for I understand that this nearby building is used as an annexe for organised groups.