Recommendations on Contiki Tour

hi everyone,

I am starting a 3 year doctorate program in August and decided I want to travel to Europe in July before I start. I just went to Greece for 12 days with my best friends and that was my first time outside the country & LOVED every moment. One of my patients recommended contiki tours as a solo travel and had all good things to say. I’ve researched and know the pros and cons. i wanted to see which Europe ones people recommended. I was lookin at European Discovery with 13 days and 7 countries. I saw a few that were by train and in smaller groups. And then ones that were just within one country. There’s so many options I’d love to hear anyone’s experience please. I’m 23 years old, female. Thank you so much!!