It’s very difficult to see main attractions with this deal, it’s better go on foot or public transport. There are several other better options and I thing affordable too
Dear Augustin R,
thank you for taking the time to review our service; our busses frequency may vary due to unforseen circumstances, such as traffic and guest pick-up. We constantly work towards improving our frequency and meet the needs of every guest. By discovering the city through our audio guides you can have a good introduction of the main attractions of Rome and then be able to come back to visit the areas you want to spend more time in.
We hope to have the occasion to change your mind!!