Hi, we have done a trip into Monaco a couple of times but it very much depends on when you are going. If it is in May when the motor racing is on, do not try as the trains are very busy, on one occasion we nearly didn’t make it back which was very stressful. For about 4 weeks before and two weeks after the F1 the streets are blocked by grandstands and you cannot get around , especially around the Cafe du Paris so not really worth going.