I was wondering if it was possible to view the files you saved on a ps3 plus account on a computer?
Also, I'm on vacation and I wanted to play ps3, I don't want to buy another one for the trip so I was wondering if anyone still rents them out
Get your Portable ID!
What do you want to do with them exactly? You can copy save files (if the game lets you) and "look" at them on a PC, but it won't mean anything. If you mean accessing cloud storage from a PC, I don't think that's possible right now. There are places to rent PS3s; you'll have to find out if there is one wherever you are.
If you rent a PS3 and sign into it with your existing PSN account information you will be able to access the cloud storage directly.
As mentioned above, you can only access those saves from a PS3 while you are logged into that account.