Another five star hotel but what makes this hotel special is that is has a wonderful thermal baths attached to it. It cost 1200HUF which is about £4 entance but it is well worth it. I'm not too sure whether it really is a secret spot but it is worth the effort to get there. But around the city there are many spas that are worth visiting.
Address:
1111Budapest, Szent Gellert ter 1 Budapest Budapest Hungary