I lived at the Delano from 2012 to 2016. This is one of the best apartment living experiences I've had, and that's out of a total of 7 apartments I've lived in over the years. The only reason I moved was to save money; however, if not for that I would still be living there today.
The manager, maintenance staff, and security are all absolutely the best I've encountered. They're professional, helpful, trustworthy, and personable. I rarely had any maintenance issues, and when I did, whatever it was that required attention or repair, 99% of the time was taken care of by the next day. The other tenants were majority working gen x and y folks w/o kids, a few small/young families, some university students, and a few retirees, and in all cases they were consistently quiet, respectful, and pleasant.
The units and grounds are well maintained. I highly recommend The Delano for anyone looking for a safe, quiet, and clean apartment in the DMV area.