I say just right with the caveat -- for a shorter duration tour. I was on this RST late April to early May, 2019 with my adult daughter and we had already vastly enjoyed VFR, South Italy and Sicily RSTs. The 2-night each stop pacing is bare minimum to me for not feeling terribly rushed even though that IS still fast and it really is a gem of an itinerary, giving you 2 magnificent big cities bookending a renowned Tuscan hill town and the fantastico Italian Riviera. At that time, Monterosso al Mare in Cinque Terre was not overrun with tourists / no cruise ships in port and we walked to Vernazza on a very lightly visited trail. Now, it had rained in early a.m. hours of our walk and the good folks at Albergo Amici in Monterosso (terrific spot in old town) strenuously advised us not to attempt the hike. We were careful and appropriate with our focus and pacing and ultimately had no trouble getting there and back, plus the weather turned out great by the time we were halfway to Vernazza, where we had a great visit to their harbor, got literally beachside and enjoyed an excellent pranzo. Back then our time in Rome included a Vatican Museums visit using the RS audio guide but we actually were guided by local Roman because even though the museum was typically quite busy, it wasn't a ridiculous mob scene. In Rome we stayed at Hotel Museum on Via Tunisi in the Prati rione; entrance to the VM was literally 'right there'. Enjoyed Hotel San Lino in Volterra and loved, loved, LOVED Torre Guelfa (13th-century former palazzo with wonderful rooftop terrace) in Florence. On the way to the Cinque Terre we had a stopover in Lucca and had a ball biking the ramparts. Should your teens be curious and engaged travelers with bonus points for having an interest in arts and artisanal craftsmanship, yes, they will very much enjoy this tour. Food is fantastic, gelato always available and advised and the history, culture, and physical beauty is Off. The. Charts. I vote GO. Have a great trip!