We really enjoyed our time at Hotel Albrici in Poschiavo, although we stayed just one night. The owner is extremely welcoming - he even opened a bottle of champagne for us (we were on our honeymoon)! The building is historic and holds many interesting antiques and paintings.
Poschiavo is a beautiful town surrounded by mountains, streams, and lakes, and is well worth the visit. Our time at Hotel Albrici was supremely peaceful and we recommend a stay there whole-heartedly.