YOU SAID:

It just so happens that I have exactly one room still available

INTO JAPANESE

たまたま1部屋しか空室がなかった

BACK INTO ENGLISH

Only one room happened to be available.

INTO JAPANESE

たまたま空いていたのは一部屋だけ。

BACK INTO ENGLISH

Only one room happened to be vacant.

INTO JAPANESE

たまたま空いていたのは一部屋だけ。

BACK INTO ENGLISH

Only one room happened to be vacant.