How to get there cheap and more
Make sure you have enough cash on hands as the reception at Oase charges 10% for withdrawals and also needs a passport to check on ID.
First of all my hotel was right by the Frankfurt main train station, from there you can take a S5 line directly to Bad Homburg its about 4-5 Euros and 6-7 train stations and 15-20 minutes of picturesque view, from here it will cost you about 20 Euros on a cab ride or about 10-15 on Uber, I can't stress enough how important is to have the app, there is internet everywhere in Germany more over the FKK have internet as well. Don't expect much of an Uber around Oase but around Frankfurt there is definitely plenty of them.
If you care to save more money, get off the tram at Bad Homburg and switch to a diesel tram that goes 2 more stations to Friedrichsdorf station, from there a taxi will cost you around 10 euros.
With this stated, Ill tell you that most of the girls: about 99% are Romanians, nothing wrong with that, but for some reason many of them hide the fact that they are from Romania, they will tell you some BS stories that they are from Russia or Bulgaria or Italy or whatever but if you know those languages its easy to catch them. Since I speak Romanian its funny to listen to all of them taking about the customers and how did they try this and that etc, the staff is also mostly Romanians, and there are few guys running around in ropes that are Romanians as well.
I felt a hard up sell at Oase, for the extras for the lets go with my girlfriend together, again nothing wrong with that but its not my style and I hate the sales push. They pretty much ask you what do you like, and from there the price goes up the hill, what I usually tell them I like this and that nothing fancy just basic.
The food sucks compared to Mainhattan you get hearth burns from all those sausages, the facilities are OK, anything is OK after Brazilian thermas.
Last someone definitely overdone on those sculptures outside, looks like a graveyard for sculptures, plus there are a few horses around you can feel a strong smell.
Overall I did not like it that much compare to Mainhattan especially that there is smoke everywhere in the main area.