If no need stay in Muine resort area, TTC Hotel Phan Thiet city is one of choice. 20 meters to sea, also pool in the hotel. 20 min. walk to COOPMART, a super market, 30 min. walk or 5 min. taxi to reach Lotte MART. 20 min. taxi takes you to Muine restaurant & Hotel area.
If you want to pay not more than USD50/night, TTC is a good choice.
But most of the guest are Vietnamese, only in Nov. - March, many Russian and German.
From Phan Thiet station, it takes 20min. (VND 80,000-120,000).
Room is acceptable. Breakfast is acceptable.
For eating out, not much choices in walking distance. Better go to Muine.