I don't know, I look at these places and don't get me wrong they're nice, but 300K seems just too much for the square footage, hence I can hear the bubbling noise ;)

Prefer someone with violent criminal history & as many noise complaints as possible. 

There seems to be a lot of people against them, mostly because of parking and noise issues.

Do any of you have ideas as to how I can buffer the noise in those vents?

I also charge a $300 fee up front for each cat or for any dog that has been owned for less than a year (puppy or rescue).Finally, I have an animal addendum that stipulates the rules about being leashed, cleaning up after, noise, damages, and more.There's more to it but it's definitely worth investigating and figuring out how to reduce risk while increasing profit.

Everyone in investing in Worcester now so I don't want to go with crowd is heading instead of locations where there is less "noise", but investing wisely as I've done so far.Any advice?

Use a low-noise fan (I use panasonic FV-0511VQ1 from Amazon) and wire it directly to the overhead light so it comes on with the light switch - tenants won't even know its running. if you put it between the wall and the light you can punch through the outside wall from the cutout you make for the fan and also reach the electric in the light. 

Renters in my category are looking for safe homes close to work & school and away from noise, a big house for their money, a layout that makes sense, and basic & durable amenities so they don't have to walk on eggshells and can get their deposit back when they move. 

And a lot of them were having troubles cutting through the white noise..

A lot of it is just noise looking to grab readers' attention.2) A lot of the same things that are tried and proven continue to be extremely valuable in these times.