I think one of the prettiest hotels here in Paris (well, at least from the outside) is Hôtel Relais Saint-Germain. I love the white façade of the building and that they always have flowers on the balconies. The location isn't bad either, if I were to stay in Paris for a couple of days this would be my ideal spot. I also love that you literally have five steps to walk to the restaurant Le Comptoir and their wine bar L'Avant Comptoir. I wish you could check in to hotels more often in your own city!