It's shaping up pretty nicely Azelor ! Do not take my proposition as a critic it isn't. If you want to have really straight lines for your buildings (again, they're terrific as they are and straightness is not a requirement to have a good city map I guess), you have these tutorials by torstan (Ill also post them in the main thread as they might help newbies like me).

https://www.youtube.com/watch?v=ftjhvGX4eyw
https://www.youtube.com/watch?v=3furNYU6yPM