This hotel easily became one of my favorite PHs. The service, food, decor, location and value for money are incredible. The breakfast is hands down one of the best offerings Hyatt has in its entire portfolio. Every single day I was so full that I barely had any food after that for the entire day.
To answer the questions above; Park Suites are the ones facing the hotel garden/pool and away from the main square. They're very quite. Lam Son Suites directly face the square; they're a bit more noisy at night.