I go to the Harvard Vanguard Medical Associates practice. There is one in Medford and Somerville. My OB/GYN is at Somerville (Dr. Koontz). She is soft spoken, but tells you what is going on and has two kids of her own. Plus, the bonus w/ the practice is there are emergency care hours on the weekends. So if something comes up, you call and a nurse calls you back to discuss the issue. There are a few other dr. in the office that you can research if you want (check out http://www.harvardvanguard.org/locs/loc2.asp?ofc=Somervil... for the location and list of doctors). I'm sure you can set up a meet and greet appointment too. They have ultrasound equipment in the office to check heartbeat, etc. if needed, but send you to an outside facility to get the "real" ultrasound tests done. I have one son who is three and am expecting another in February and both have been w/ Dr. Koontz. She is affiliated with Mt. Auburn Hospital, that is where I delivered and where I'm delivering again. The only thing is there are a few doctors on call at the hospital so when you are in labor, you get whatever doctor is on call that day/night. I didn't actually have my OB/GYN deliver my son b/c another dr. was on call, but my OB/GYN called me while I was at the hospital to check in. I had a good experience overall at the hospital too. There are opportunities to "meet the doctors" that is held at the hospital which is nice, you get a tour of the maternity ward and can meet and ask all the dr. that may be on call questions. Call the hospital for more information on this.
Good luck no matter what you do!