ul. Śmiała 1 = No. 1 Śmiała Street. m3 = mieszkania (apartment) 3. So the address in English is Apartment 3, No. 1 Śmiała Street.
Ul. Śmiała is in the southern part of Żoliborz in Warsaw, almost in the city centre, you can find it on Google Maps. I know it well; it's a pleasant part of town. Quite an expensive area nowadays,
Don't worry about the 32, that signifies the local post office, a few streets away on ul. Filarecka. Now Warsaw addresses no longer list the local post office, There's a system like postal/zip codes instead.