A really really really good place if you really want to learn how to boxe. The coaches are really…read moregood and motivating. The place is relatively big for a boxing club and easy to reach by public transportation (bus 2 direct from slussen). Never underestimate the easy access when you are dealing with a sport as demanding mentally and physically as boxing.
Even if the fitter the better when it comes to boxing, I don't recommend you to start this sport if you only want to get fitter, or at least in "serious" clubs like this, because the focus on the technique is a massive part of the training. Getting the movement automatic even when you are tired at the end of a round.
Learning boxing technique is mostly a personal matter after having learnt the basics of the movement. When it comes to physical preparation, I find some of the movements asked by the coach to be slightly outdated, but after few months I still fear the sunday training, which means that it is still effective :)
Finally, there are a lot of training options, for all levels and a lot of very passionate persons. Boxing never was an easy sport, but this club definitely helps you wear the gloves more often.