This place is a favourite of mine - the food is great and the staff are super friendly. If you're new to Tibetan food, they'll guide you through the menu and make recommendations on what to order.
We live in the neighbourhood and come here fairly often to eat in and get takeout. My hands down favourite things on the menu are the chicken hot & sour soup (Khatsa Kha-kyur Thang) and the steamed beef dumplings (Shae Mo). The soup is pretty spicy (as promised..) but so great, especially in the winter.
The back patio has just been renovated so this is a nice place to come in the summer too. The beer is pretty cheap, which is always a plus!