capital is open now, but even different places, such as Munich or Frankfurt. You can go there for longer weekend or entire vacations (the website). Even when you are going for a labor, you can use any cheap flights Germany isn’t very far away, but it is always convenient to shorter your journey from six to 2 hours. To get nicest deal, you need to reserve your flight couple weeks ahead.
At the moment, many of Polish people are living in UK. Also, they are trying airline tours from the capital of this island. If you are interesting in city break option, you should book flights from London to Vienna. Maybe this city is costly when you are earning in Zloty, but for an individual who are earning Pounds, it should be nicest place. Metropolis of Austria is and always were very interesting place (find here). It has plenty of beautiful building, great art galleries, and many restaurants, which are serving delicious cuisine. Vienna is city accurate for each term of the year, so you do not need to be afraid to get bored, in autumn for example.