We were very pleased with Thien An. The rooms were very clean and bright. You don’t really need AC in Dalat, but it is there if you need it. The showers were hot, but the hot water didn’t last long. If there were more than 2 in a room, you couldn’t all take showers without a wait in between. Even during one slightly lengthy shower, the hot water ran out. Breakfast is very extensive. There is good wifi on each floor and there are several computers in the lobby.
The family that operates the hotel is very friendly and helpful. One in our party had a very early flight and they agreed to a 6am breakfast even though they don't usually start until later.
Some other reviewers point out that the location is further out than similarly priced hotels (like the Dreams group). That is true. But Dalat isn’t really a walking town, so I’m not sure if that makes a difference.