If you’re staying at Lumiere, expect a small boutique guesthouse with compact, modern rooms rather than large hotel suites; it’s tucked in the Prati/Vatican area so you’ll be about a 10 to 15 minute walk from St. Peter’s and very close to the Ottaviano metro, which makes getting around straightforward. Book early in high season, travel light because rooms can be tight, and confirm late check-in ahead of time since reception hours may be limited. Breakfast tends to be a basic continental spread, cards are usually accepted but keep some cash for tiny neighborhood cafes, and if you need peace ask for a higher floor because street noise and thin walls can be an issue.