This map is decent. There are two things I have in mind though for it;
I feel like you should use upscaled versions of textures instead of point sample, like I assume you're using. I did point sample for some of my older video game recreation maps, and it's generally a strain on the eyes for most people. If you have a program like paint.net (it's free) you can easily upscale the textures to something like 256x256 and not have to use point sample for them. They'll look much better that way.
There's also the fact that a lot of areas in this map are... empty. Big open areas that are just 4 walls and a floor and ceiling. Some areas are not that obviously, but most are. You should definitely do more detailing with the Minecraft textures you have at your disposal. Possibly some decorations, height variation, etc. It may be a trade map, but some people like to fight each other on a trade map after all! You should make it interesting for them. Do those things, and I'm sure this map will be even more enjoyable!