We arrived in Da Nang as our first destination in Vietnam before we travelled around. Princess hotel was exactly how I imagined a budget 3-star hotel in Vietnam. It was clean, comfortable, breakfast was decent (they did their best to make us westerners feel at home), room was big and the staff were very kind. Nothing more I could wish for l, for this price.
Obviously if you expect the same standards as in Hanoi, Hue or HCMC you may need to lower your standards or pay a bit more for a different hotel.
I'd definitely recommend to anyone who is looking for a cheap stay in Da Nang. You may need to look up the address before arriving, as the taxi drivers in Da Nang do not really seem to know their way around, but even if they drive you around the block it's extremely cheap!