Nailed it, plus it's hugely useful for researching things to do locally, opening hours, routes, restaurants etc and booking stuff (last year I booked a fishing trip, speedboat hire etc). Work blackberry stays at home.
Had this in many hotels. Can't use two devices at a time, but can log one off and the other on using the same credentials (usually a password on a till receipt from reception or similar) usually. They don't tell you this.......
Tend to check this before I book, as it avoids having to moan about it afterwards. Just something to consider within the overall cost.
Where it's limited to one device, usual option is to sign out, then log in from the other one with the same details. Works with most hotel pay as you go...