Second this. Absolutely maintenance free and easy to use if all they want to do is check email, Facebook and the web.
For the Chromebooks, I typically stick with Epson printers since they never seem to change and are well supported. You can pick up an Epson XP-420 usually cheaper than buying ink for a 5 year old printer.
As for the Chromebook, stick with either a big screen notebook or go for a chromebox/chromebase model and use their existing monitor or TV to use it.
Setup Chrome remote desktop so you can remote into it either by invite or on demand.
Also, as with any PC, make sure you install Adblock plus on the Chromebook. People do not understand modern ad's and they will get a scam phone popup or a malicious redirect if you don't. Not that it will do damage to the chromebook, but if you don't want to deal with that call asking if it's real or wanting you to scan the box for a virus that does not exist than Adblock plus is a must.