This beautiful website shows a list of hotels with numbers above and below 0815. It looks as if these 0815 hotels are truly middle class and have checked off all the things they have to do exactly to get in the class they are in. Some people tend to scorn middle class, perhaps thinking they deserve better, perhaps not liking the sense of calculating place. Petty bourgeois is what people sometimes call this.
Best wishes Nancy

An educated guess:
0815 is used on the Internet to say that something is not wanted (or under construction), like 404 is 'document not found'.

Your man is most probably an internet-addict:)

- haven't seen any 0815's related to hotels (yet)

Enter 0815 at e.g. http://ragingsearch.altavista.com
where you'll find quite a few references to this number.
Some personal pages read:0815 and then say: now you'll understand why I'm not wanted, whereby his/her CV shows up ...
Others come up with subjects nobody (or only very few) is interested in etc
HTH

In these run-of-the-mill type establishments, breakfast consists of a standard pat of butter, one portion of jam, and - if you're lucky - a single
(I don't know what "open" means in this context - maybe dried-up) slice of meat/sandwich meat or some other type of cold cut.

In good hotels, a guests is not treated like just another/an ordinary/any old traveler ...
(to interpret the meaning of wishy-washy here a little more context is needed.)
HTH - Beth

"In the mediocre hotels you get a tiny portion of butter, some marmalade and, if you are lucky, a slice of sausage."

In good hotels, one is not so commonplace, where drivelling is....

The expression 0815 or 08/15 comes from a movie, I think it was a science fiction thing from the 60ies. Since then, German colloquial usage refers to something that is so normal as to be boring and small-minded. A 08/15 vacation is one that you book where you do nothing out of the ordinary. A 08/15 person would be someone who doesn't and in fact isn't able to do anything special whatsoever - not even read a book other wouldn't read, let alone say something that isn't "everybody's" opinion.

This is the background for the phrase, and therefore a 08/15 hotel and breakfast is something extremely undesirable - if only because people like to be special and different.

HTH
Sibyl