You can read the full story in our self storage post for that location.  

The negative equity often exceeds $50k but even if I use $25k (it would be rare to have this low of an initial negative equity position), is nearly 2.5 years to recover.  

On a different journey I completed AJ Osbornes self storage program and thought it was very useful.

Also, what are some other low cost amenities that I can add to my STR that will yield a higher ROI?

Your estimate seems low, but even at that cost, it will not add that value.  

Does anyone know a property manager that supports small self-storage rentals in addition to residential rentals?

Put a bunch of boxes and crap in that newly converted storage closet. 

I could never guarantee that every student would find a deal but we have so many success stories and people have switched from investing in MF, MHP, Storage to office, retail, medical, industrial etc.   

If you don't want that, I would sell it or put it into storage (which may not be financially feasible), but long-term renters are hard on furniture that is not theirs. 

Thanks GuysI have shown hubby and he is agreeing not to use this companyHe is looking now at storage investing, while we get accredited as investor thanksFiona