Google

Working environment is great. You meet and work with a lot of really smart people. You can travel and work from any of Google offices after taking permission from your mentor. As an intern, you are working like a full-time employee, with no difference between you and a full-time employee, except in some code permissions if you are not working on an open-source project.

Most of the cons, I think, were very specific to me and I don't think they are general cases.

• Once I started, there was no project for me, and I chose my project with my mentor when we were taking a walk after a fake fire alarm in the building :)
• I was working alone on my project with my mentor. So, I missed working with a team there!
• I didn't take any training at the beginning, and I started on the project my mentor and I chose.

Try to have an intern for the team, not for one mentor. And yes, one mentor can be supervising the intern's work. I think by this way, all the interns will have the chance to work with all the team members and will learn more faster and will increase their productivity.