Based on 10 years of my life in Vietnam, I can say, in Dalat, there would be no better hotel for foreign budget travellers on the room rate unless you speak Vietnamese well.
You can find cheaper hotels in Dalat, but the staffs can't speak English nor professional. So if you dint speak Vietnamese, you may fall into some troubles in the locals focused hotels.
Yet. what I felt from Thien An was that the staffs are very proud of what they are doing and truly care about guests from the bottom of their hearts.
I will definitely consider to stay in this hotel again for the next trip.