I think it is a good thing that you are the first to be interviewed and I'm sure they did that on purpose. Usually the stronger candidates are first so that they can "compare" the others to the "baseline" (you!).
I don't have a lot of info about the salary negotiation but also...don't forget that at the time you discuss salary, you can also negotiate other terms of the contract (ie. vacation time etc). Sometimes holiday periods are more important than salary (depending on your priorities and what you want. Also, hours can be negotiable etc. Don't forget about those "little things".
Either way: GOOD LUCK1