Code 1

Can you crack this code? It's deligthfully simple once you understand it, yet may be dreadfully difficult to solve.

The image is small, I know; to be clear, the whole thing is one continuous line, starting from the left and zigzagging around. The nodes may or may not matter.

If you want a hint, transpose each of the following letters to the letter before it (and each number to the number before it):

Uijol cbtf-9.

Have fun!

Hotel Infinity

David Hill went off to stay
At Hotel Infinity
“Don’t bother,” the clerk did say
At Hotel Infinity
“There’s an infinity of rooms here,
But an infinity are taken
Would you really like to walk up to
The next room that is open?”
David smiled slyly, and said
“Just tell all to move up one.
The first room is now vacant, and
This problem is done!”
“That’s all right,” the clerk agreed
At Hotel Infinity
And David Hill got his need
At Hotel Infinity
But while the clerk thought he was done
And he smiled quite contently
An infinite busload arrived
At Hotel Infinity