Traditionally region around streets Staples, Brzeska, Zabkowska on right side of Vistula river is considered unsafe. It nowadays it's mostly gods, but never less I will not walk there at night without reason. Below is the map of crimes in Warsaw by city districts.

When visiting Warsaw, you should avoid limiting your trip strictly to the Old Town. While beautiful, it was almost entirely reconstructed after WWII; the "real" soul of the city lies in districts like Praga, which features authentic pre-war architecture and a gritty, artistic vibe. Avoid using "unofficial" taxis; always use regulated apps like Uber, Bolt, or FreeNow, or look for taxis with a clear company logo and rate card on the window to avoid being overcharged. Be cautious of "gentlemen’s clubs" or strip clubs in the city center, as these are notorious for aggressive touting and occasionally "spiking" bills for unsuspecting tourists. Additionally, avoid drinking alcohol in public spaces like parks or streets, as this is illegal and strictly enforced with fines. Lastly, don't forget to validate your public transport ticket immediately upon boarding a bus or tram; ticket inspectors are frequent and will not accept "I'm a tourist" as an excuse for an unvalidated ticket, resulting in a hefty on-the-spot fine.