Sopot is a part of 3-cities: Gdańsk, Gdynia & Sopot called in one name as: Trójmiasto. This is a big aglomeration so the buildings are everywhere, so if you don`t have UAVO license it will be forbidden for you to fly in Sopot, because in every place you will find builings and people.
The map link you have pasted is OK, but it doesn`t show everything. For example there will be NATO trainings Tiger 2018 in Poland in may 2018, and this information is absent on the link you pasted, because it is AIP Poland, that is constant zones. If you know more about a local zone you have to see something called as AUP Poland, that`s why I recommend you install Drone Radar mobile app - it is not expsensive and it is in English version either. Click on "google" button on Drone Radar map (not "google" websie as you may think) and search over the location you want. You will find actual and constant zones and the periods when they are active or not and what it is altitude of them. It is the best source of infromation and it is must have for every drone operator in Poland.