I love both my primary care phys and my dentist. My dentist is in Georgetown so not very convenient to the metro, but the D6 metrobus does stop right across the street. I've been going to him for 11 years and I love him -- it's funny, after my first visit, I felt like I'd been in the dark-ages of dentistry with my old dentist. Dentist = Dr. Fattahi ###-###-#### -- 4434 Maccarthur Blvd.
My primary care physician is downtown and a short walk from either Foggy Bottom, Faragut West or Faragut North. Dr. Pocinki ###-###-####. I've been seeing him for 10 years and I've always received great personal care. He never rushes me out the door -- takes plenty of time to talk to me about how I'm feeling/ what's going on/ etc. He also caught my thyroid disease in it's very early stages (before I had any real symptoms to speak of) at a routine check-up. The only downside is that he no longer takes my insurance BCBS, so I have to file with my insurance company directly which is a headache, but I don't mind b/c I think he's such a great doctor, it's worth it.
Don't know if you are looking, but I'm also a HUGE fan of my OBGYN practice. Foxhall OBGYN ###-###-####. I switched to them when I found out I was pregnant b/c I wasn't thrilled with my old practice. They aren't really near a metro, but the metrobus stops in front of their office.