As we had a 5-6 hour wait for our connecting flight we chose to spend 3 hours at the Plaza Premium, which was very relaxing and definitely worth the price.
Good place for budget stay. Near to many local shops/restaurants, so you won't hungry for 24/7. For transportation you can walk to nearest bus station for 5 minutes or Paya Lebar MRT station for 15 minutes which can take you to whole island. Hope you enjoy your stay as much as I do. Cheerio.