This place is awesome. Yes, it's loud. Really freakin' loud. It didn't bother me, ear plugs for sleeping work. I actually am going home with a ton of great new music from what was played at Salina.
I had a private room with bath. It was modest, clean and perfect for just me. The staff is incredible. Helpful, warm, friendly. The breakfasts were amazing. The location is the best you can get. My friends stayed elsewhere and ended up hanging out at Salina with me.
If I come back to Cusco, I'll stay here again. Seriously loved it. If you're looking for the Ritz, keep looking. If you want a reasonably priced place with the best location in Cusco, wonderful atmosphere, food and staff...book Salina Plaza de Armas. Just pack some ear plugs.