You can still make 1 visit, but there is no (free) room that you could stay in.

but half my hotel (Eili II) was empty

The only thing I can think of is that maybe you were not signed on? And thus you were anonymous and anonymous people can't book into suites.

Other than that I don't know, maybe a temporary bug?

why can't they book into suites? thats stupid. wish it said that in help

ok I built some non suite rooms and asked them to try again and people still can't come and stay if they don't have an account already so only guests I can get period are people with accounts and dry guests in my non suite rooms only. this is ridiculous. if it doesn't get fixed I will be ready to quit. its stupid if u progress and then you can't even invite your friends to come visit to help raise more money.