The coordinates do not take you directly to the cache, just to Stage 1 in the front of the place where the cache is located. You'll see what I mean. Very easy to get to, but it might require a little thinking or maybe asking.
The staff here are aware of this cache and has even helped me in finding a suitable home for it. You might think this cache could disappear for up to two weeks at a time, but it can't, it is not allowed any further than the front door. When pondering this final location, use caution, this place is usually full of muggles. I don't want to say too much and make the cache too easy, but the title and description should help you find the cache. This one could even be done while it is raining. Log only and bring a pen. Good luck! Cache is available Monday-Tuesday 10 a.m. - 8:00 p.m., Wednesday 10:00 a.m. - 6:00 p.m, Thursday 12:00 p.m. - 8:00 p.m, Friday and Saturday 10:00 a.m. - 6:00 p.m., Closed Sunday.