To be honest, I really don't know what RSM stands for. The sign said: RSM Lutong Bahay. Anyway, we came from a very long road trip that day. We were all craving for some home-cooked Filipino dishes. My dad would always eat at RSM everytime he goes to Calamba. It sure is a nice restaurant. A bit pricey though for a lutong-bahay resto.
The restaurant's ambiance is very cozy. I'll take it as a good reason why we paid a little extra. I wouldn't mind paying for comfort and fine dining. Especially after taking a long drive.