In my opinion, your best bet would be to get on EROS - DC. Take a look at Visiting Female Escorts. At this time (4:33pm) there are 70 girls listed. I see several around the 24 y.o. age range...but that's the best i can find. Some very very attractive.
Step 2: Pay for a month of VIP access to be able to search based on age range, race, services you'd want, average ratings, etc.
We appreciate people who are getting interested in the hobby, but you're sorta asking for folks to do the legwork and give you info that the rest of us pay for the privilege of. The suggestion that was made for Eros was due to the fact it's free to browse, but as you've probably noticed, is 50% fakes and scams.
If you want more legitimate options and some guarantees for legit providers, I'd recommend becoming a TER VIP. If you're willing to drop $300-400, another $30 isn't a big deal for peace of mind.
I did not NCNS that client. I told him I was not interested in seeing him. I shouldn't have met with that client anyway because he had a bad reference, and I was warned of what could happen. He became very aggressive about knowing details of my personal life, he repeatedly asked for my real name, texted me non stop after I asked him not to, called 30 times in a row if I did not answer, etc. After I told him I was not interested in seeing him on my last trip to Alexandria, he called a provider friend of mine to get my name and hotel. He asked her to call the hotel and get my room number so he could come up and talk to me, all kinds of crazy things. No, I am definitely not interested in seeing a client like that any longer.