Hello-we have booked a highly recommended private guide for the Forum, Palatine Hill and Colosseum for June 11th. We are looking to share the costs with another couple, no children please. My husband and I are early 40's, easy going and relatively quiet. The guide has recommend 6-7 hours for an in-depth leisurely pace. The cost would be about 540 euros total or 270 euro per couple. If you are interested send me a PM and I can give you more details.