Last 100 km - which route based on these criteria:

My greetings to all; this is my very first post. I plan to walk the camino in just about a year. I'll have a week and would like to walk the last 100 km but am not sure which path to take. I'm female, will be turning 60, and in medium decent shape, but I've never done anything nearly this adventurous. I'll be alone by choice, and would prefer a quieter route. But I'll also need a route where places to sleep are not too few and far between - I know I can't walk the long stretches that are required for some routes. With that said, what route is most scenic, not too strenuous, and not too isolated, but still meets these criteria? I seem to always circle back to the Camino Frances based on all the research I've done, but want to make sure I'm not closing off other better options for a more contemplative experience. Thanks to all for any and all advice.