One approach is to plug the information into the free vmr canada web site.
www.vmrcanada.com If the car is an EX model with leather then at 270 k, the low end is 3975 and the high end is 5850. As a private sale, it should go closer to the low end. Vmr is showing a 2 door as only $25 less than a 4 door. I think that's wrong. If you look at autotrader.ca you'll see that 2 doors are selling for a lot less than 4 doors.Things to be aware of are:1. When was the timing belt last replaced? The Accord has an interference engine. Check the Honda maintenance schedule to find when it should have been last done. I think it is every 90000 km. If it is overdue, then factor in the cost of a belt and probably water pump into the price of the car. I know that for the 2000-2002 4 cylinder Accord, Toronto mechanics and Honda dealers were asking for about $800 for the package of belts and water pump replacement. You get the water pump done at the same time because its in the same area as the time belt and the cost is the labour to get at it.2. Check with your insurance company on the price of coverage of a 2 door coupe even if you don't buy collision/comprehensive and especially if you're under 25. I checked out this car by searching for "How Cars Measure Up". And found, surprisingly, that the Canadian insurance experience in 2005 for the 1998 2 Door was very average for theft, collision, injury and comprehensive. That's good news for you.3. Even if its a friends car, get a mechanic to run a proper engine diagnostic. I almost bought a 2002 Accord. The check engine light was off. But there are some diagnostic codes that don't turn on the light. This car had one of them --- a code that either meant a bad transmission sensor or a bad transmission. I didn't buy the car.