Hi Ad Astra,
Some people at my university, here in Colombia, finished there Phd studies at Harvard, Yale and Cornell. The harvard alumni, said to me that the university can be really competitive and the time that takes finishing the degree is long, he took almost 8 years, but he got a other Phd on portugal. The one with Phd in Yale is unemployent and is kind fo desesperate, and the persons of cornell got really great placements, besides that, Cornell is really good in latin american studies and not as stressfull as Harvard. And be sure who you want to work as your tutor in harvard, I knew that many amazing professors go to other universities because of pressure issues (Like booteels or Carcamo). Of Columbia, I cant say much, but here is the place all people want to be. XD
Congratulations for your acceptances,
XD