Our adult family of 5 took this tour in early May & it was fantastic! We were the only ones in the tour but I think the groups can be up to 10-12. The tour lasts about 3 hours & Rahul was a great tour guide! He really made the ancient Roman ruins come alive with his stories! Touring the underground part of the Colosseum was awesome - entering through the same door that the gladiators entered through 2000 years ago! Definitely recommend this tour & Rahul!