1. there are cities which are not where they should be. Warsaw should be slightly lower and on the opposite side of the river.
2. Krakov should be much more south-west and on the northern side of the river.
3. Plotsk should be a bit west and on the northern side of the river.
4. Lublin should be approximately where Babice is now (and Babice should be removed completely).
5. Nidritsa should be moved a bit south and I suggest renaming it to Ciechanow.
6. Also Breslau is in the wrong place, should be approximately where I marked.
7. Chenstokhova should be moved as well, it's in terribly wrong place.
8. Lviv should be a bit south.
9. I think it'd be better to move Wadowice to the new location and rename it to Sandomierz.
10. Amere - to be honest I've never heard of such city in Poland, I think it should be moved to the new location and renamed to Rzeszow (biggest city in that region)
11. same with Sambir - moved to new location and renamed Przemysl
12. I would suggest renaming Widawa to Radom
13. Lodz at that time was just a village, I suggest renaming it to Sieradz - it was the biggest city in the region at that time and with a castle.
14. Poznan is right now a protestant village while in reality it was the largest Polish city in that area (actually this area is the "birthplace" of Polish nation, from there our first rulers reigned so it definately should be assigned to PLC), so I suggest changing it to Polish city or castle.
15. there are two very important cities missing - Torun and Gdansk, they definately should be added because of their historic importance.
16. If you move Breslau to the new, real location, the area would become empty, so I suggest adding there a Polish village of Konin.
17. Also Kamienets should be moved far east, approximately where the village of Potoki is. And should be renamed to Kamieniec.
18. I also suggest adopting consistent naming system. For example right now we have an English name for Warsaw but Polish name for Krakov (also written with an error - it should be either Krakow or Cracow). So I suggest changing all names to Polish ones which would give them a unique flavor (I think original names in their original languages are better and add realism to the game). If you agree then they should be named as follow:
Warsaw - Warszawa
Plotsk - Plocko
Chenstokhova - Czestochowa
Nidritsa - Nidzica
Allenstein - Olsztyn
Krakov - Krakow
Lviv - Lwow
Vilna - Wilno
Slutsk - Sluck
at least these should be corrected.
And I don't know if this is a bug or a feature, but I've just become a captain and decided to build something in Warsaw - I spoke to the guild master and he told me that I can't build anything there because I already have a mill there. And I did not order anything to be built there previously. I also see no list of buildings built in various cities - in other mods there was a screen with a summary - city name, what building have been built there and revenue).
Also the training field close to the place where I suggesteg adding Gdansk is placed in the sea.
I also suggest adding a "#" sign before names of the castles - right now there is a lot of castles on the map and many cities (places I would definately call a city than a castle) are actually castles and it may be a bit confusing. For example instead of Stettin Castle it would be #Stettin.