I just had a rather unfortunate experience with one hotel which I'd like to share, so that others can be warned.
As any regular traveller knows, some hotels charge for internet access, while in others, it's complimentary. It's usually pretty clear which is which. However, I got caught out at the NH Duesseldorf City Nord hotel, which pretends that it's free and then slaps a charge on you when you checkout.
There is a sign in reception saying that wifi internet access is free. It doesn't mention that wired access is chargeable, so I just assumed that would also be free. Usually, if you log on to the internet in a hotel where it's chargeable, you get routed to a screen explaining the charges and asking you to enter your room number or something to agree to the charges. Nothing like that here: you plug in and you're connected to the internet straight away.
Anyway, be warned.
Has anyone else ever come across anything like that? I stay in a lot of hotels, and this was the first time for me that it wasn't perfectly clear whether internet access was free or chargeable.
BTW, this was not the only problem I had with the hotel. You can read a full review on the appropriate TA page (or via my profile) if you're interested.