I went with this gym for the year I was abroad because it was within walking distance to my…read moreapartment. I can't imagine coming here if I was driving here, as this part of Schwabing is very busy so there's limited street parking. It definitely wasn't the cheapest gym as far as membership by any means (89 euros/month last I checked), but I found that the facilities were well-equipped / somewhat well-maintained and there was a good variety of group classes available (cycling, cardio kickboxing, yoga/pilates, strength training, HIIT, TRX, etc.) to keep me motivated in coming regularly.
It's definitely a very busy gym, especially during the evenings so if you're coming in at peak hours (after 5pm), expect to have to wait to use the popular weight machines or general equipment. I can't comment much on the staff since I didn't really interact with them much, but they were generally nice if you needed help.
+ it probably won't help much since courses on the website aren't listed by instructor, but any class offered by Rainer or Jutta (cycling or Hot Iron/Iron Cross) is definitely worth taking.