Best tablet for older person

So A little while ago I got my grandmother a nice new large plasma tv, but now I wanted to make it easier for her to watch stuff on the tv. I got a chromecast for her as well and linked it to the local wifi, but now I need to pick out a tablet so she can control my netflix account (been waiting for the multiple profiles, I am the only other one using the account since I think it allows two simultaneous streams this should be ok).

I was thinking the best cheap tablet would be the nexus 7 but I wonder, would it be better for her to use a larger tablet for browsing and netflix control?

Which do you all think would be best?