Hi Cromwell, Krusha is one of the prettiest places in the area, which is beautiful. Your folks will appreciate the scenery. It is not far from Kamchiya, a resort with a river, the Kamchiya River, flowing in to the Black Sea and with a good stretch of sandy beach. Avren is good as well and I have bought some building land there which enjoys excellent views. The good thing about Avren is that when I was there after Easter they were repairing the road to connect to the main Varna-Burgas road. Your folks will certainly need a car - something robust (or not too expensive) as the roads are pretty dodgy...but like the Avren road it will get better with time. Having been on business to BG many times, I think the area south of Varna is some of the best I've seen on the Black Sea coast. However, most of the more remote villages are kind of simple and might be a culture shock for your folks - they were for my wife!
There are Internet cafes in Varna so no problems there and good shopping. If they got the Internet at home, however, they could subscribe to something like Skype, an Internet phone service and keep in touch with you at local rates.
You might reconsider going next year as I've discovered that BA have a scheduled direct flight to Varna from London twice weekly starting 25 March 2006 (Wednesdays and Saturdays). It doesn't appear to be too expensive. You can get to BG (Sofiya) by Wizzair from Luton (cheaply)and to Varna by Malev, but in both cases you have to change in Budapest - great place to visit, but adds hugely to time. I shall certainly use the BA option next year. Hope your folks enjoy it.