So, first timer in Rome, need to fit 3 to a room which rules out a couple options I'd otherwise try for (W Rome seems to have strict 2 person occupancy limit).

I'm holding a week at Pantheon at the end of March, but it's an eye popping 670€ a night. The LM and Westin options appear to be considerably cheaper (some 350-370€ a night) -- am I missing out on anything by booking either of these options compared to Pantheon?

Not the biggest fan of the Westin room design from some of the photos, but if it means saving 2000€ ...