My girlfriend and I stayed at the K Hotel, for 8 nights a few days ago. We are in our 50's. We paid 1200B a night for deluxe. A bit of noise from disco a bit further up Ratathit Rd, but tolerable. Excellent pool, great food in Beergarden restaurant, close to Bangla. We will be staying there again next year....only 48 weeks to go.
http://www.k-hotel.com/english/hotel.htm