Okay, I realize that Charles didn’t have the advantage of quality telescope optics such as those we have available to us today. I can even accept the difficulty of differentiating a globular cluster from a comet in his day. But Charles come on! Turn the focus knob or have a little less wine with your cheese already!!!
Seriously, Messier 29 through most any telescope available today is easily seen as a fairly course open cluster. It lies in a dense region of the milky way near Gamma Cygni. Grab your binoculars or low power eyepiece for this one.