Vet Looking for a vet, what type of info can I get about the Dr. without an appointment

I had mentioned in my introduction Truffle had gotten very ill, from everything I can tell this is the healthiest I have seen him since the day he came home. Thinking Truffle might be a boy after all but still not positive. So I do not need a vet asap, but I would like to do a check up and make sure he really did fully recover. Because of his age (I am guesstimating still under a year) and am thinking that the case of malnutrition could have possibly effected his development in some way.

I have found only two vets within about an hour drive of me, which I find very strange considering I live in a very populated and diverse area. When I called I of course spoke with the receptionist. One of the receptionist did not have very much information about services of guinea pigs, he told me that any questions I have I will need to make an appointment with their exotics vet and she can answer them for me. The other receptionist at least made me feel better about how little I knew about guinea pigs when I got Truffle lol. I mentioned to her I was considering getting a second guinea pig as a friend so I wanted to know if they offered spay/neuter services in case that was something I would want to do later when she proceeded to tell me about how guinea pig litters are small and the babies are so so cute she didn't understand why I wouldn't want babies. Receptionists are not the doctors of course so I won't let that alone scare me away.

The cost of the office visits were not outrageous but more than I would like to pay just to find out if the vet I would be using is not an idiot lol. Without going in for a visit what type of information can I find out about the doctor? I assume like number of years of experience, and what services they provide but I don't know what else. I did find out one of the doctors only has two guinea big patients both with the same owner.