XQEMU isn't very usable right now. If you're not a developer you probably instead want to take a look at xemu, a fork of XQEMU which makes different accuracy tradeoffs but has much better performance as-is.
This project is still early in development. At this point, the intended user is a developer who is capable of acquiring the necessary ROM images, and compiling the project from sources.
Audio does not work, and graphics are slow and buggy, but progress is being made! Please visit the issues page on GitHub for the current open and active tasks.
If you are interested in helping to improve XQEMU, you are most welcome to contribute! There are opportunities for people of all skill levels to contribute. Check out Developers for more information on how to get started.