I received an ESR Marie Sklodowska-Curie fellowship from low-rank university, should I accept it if I don't want to go into academia?
you say it very well:
&quot;What motivates me are the research project, the fellowship, the partners within the ITN (involving other very high-rank universities), and my potential supervisor. I believe I could use all these opportunities to create a great network. Maybe, do a postdoc in a high-ranked uni afterward.&quot;
This is really what counts, more than the university ranking.
What counts is that you are passionate about your research project and you get the opportunity to meet and collaborate with great people in your field (your potential supervisor appears to be one of them).
In my view, you should take the offer.
All the best!