Quoted By:
you 100% have a valid complaint for the landlord, as most leases would have a clause about creating a nuisance for the other tenants, but if you want to try to work with her and not go to war, you could say that it's still really bothersome, and suggest some more professional quality isolation. this is how rich people would handle the problem in a posh co-op building on the upper east side
she probably doesn't have the funds to install a complete false floor, so a halfway solution would be a stand-alone isolation platform with 2 or 3 layers of anti-vibration pods and sound deadening material. MDF is probably as good as you're going to get here
you figure out how many layers (based on budget and isolation expectations), the more the better. each layer is 1 inch MDF. plywood could be used on a budget but it does resonate more. you layer it so that the isolation pods below each layer are offset to the maximum practical extent from the isolation pods in the layer above it.
then you determine the combined weight of the rider + stationary bike + top layer of MDF, and divide by the number of isolation pods beneath it. that's your weight requirement. probably, sorbothane hemisphere # 0510150-30-10 would be in the ballpark but refer to their product guide for a table of weights. an isolation pod/hemisphere that is spec'd for much more or much less weight will not be as effective
if you want to enhance it further, each MFD layer can be *gently* stuffed with some acousta-stuf polyfill, just don't do so much that it's transmitting vibrations between layers, this is just to damp out the acoustic energy, less is more here
also, a turbo trainer such as a megene T500 would likely be a big improvement over a heavy, traditional exercise bike like in your pic
this won't completely eliminate the problem but it is likely that it would bring it to a tolerable level where you're not finding your quality of life suffering from her exercise routine
