So those are the times for the train that stops directly at the Tambo del Inka?

If so, that's pretty convenient. I stayed overnight in Aguas Calientes -- catching the train at Ollanta. I liked my stay well enough in Aguas, there's a good French restaurant (El Indio Feliz, I believe), and my hotel was cheap and comfortable enough. I also took an evening train back to Ollanta. "One full day" at Machu Picchu was certainly enough to see the ruins for me, and I was in no way rushed. Would it better to just stay in Tambo? I don't know. Not moving your luggage would be nice, but getting up early for the 6:50 train wouldn't be great (nor terrible). And Tambo will be more expensive than accomodations in Aguas. So I think either option is plausible -- personal preference, if you have one.