The Haute Savoie is famous for Apartments and Chalets with triangular (trapezoid) shaped windows, and it can be really difficult to find a solution without losing the amazing views that we are so lucky to have here.  Again, I work with Luxaflex blinds, but can also source rails that have a brake system, so that curtains stay open rather than falling back down.  Choosing the right design can really make a feature.