Hi! The perks with a junior suite (Sea class) aren’t nearly as great as Sky or Star class. We were able to make nightly dinner reservations at Coastal Kitchen, we got the Salt & Breeze bath products in the cabin, bathrobes in the cabin, twice a day cabin servicing, and double points.
Hi - the bed was the standard “Royal king”, basically two twins pushed together. The linens were clean on the Symphony and we slept well. Our room steward offered a mattress topper to us but we didn’t feel we needed it.