The address of Szechenyi Bath and Pool, Budapest is
in English:
9-11 Allatkerti korut Street, Budapest, District 14 (on maps, you will see District XIV), H-1146. (i.e. the post code is 1146)
in Hungarian:
Budapest, XIV. kerület Állatkerti körút 9-11. H-1146
If you want to send a mail by post, please use the official Hungarian name of Szechenyi Baths and Pool in Hungarian, which is
Széchenyi Gyógyfürdő és Uszoda.
See the location of Szechenyi Spa Baths compared to the river Danube, and downtown Budapest (in the left hand corner in the bottom):

See the location of Szechenyi Spa Baths compared to other Budapest attractions in the City Park of Budapest on Budapest Tourist Map.

I have been trying to book on your site for later this month and all goes well until payment. I am presented with the Paypal screen but no option to pay as a guest by credit card. Is there a way I can pay by credit card please?
Hello Chris,
the Check out as a guest option is not available worldwide. We have contacted you via email.