What's the best way to listen to ebooks?

My wife used to love reading but since her stroke has aphasia, no speech, limited vision and limited dexterity in her left hand only. She can select TV channels on a remote but she cannot read a short news story let alone a novel, so she listens to the radio and watches a lot of TV. I thought of getting her a Kindle e-reader but they don't seem to do text to speech any more. A shop assistant suggested a tablet with a text-to-speech app. It needs a really simple interface or my wife will not be able to use it without assistance.