That's probably a bad translation. Warsaw doesn't have NAmerican style suburbs.
It has Polish-style suburbs. Being in Europe, that's no surprise. Sadyba, Wilanow, Ursus,Zoliborz etc.
If you mean residential areas outside the city limits, there are plenty of those too. Piaseczno, Komorow are two examples. One of the posters here lives in Komorow, and I lived in Sadyba.
I don't know Warsaw well
Evidently.
I'd say suburb first and outskirts only as an afterthought. To me, e.g. Kabaty are definitely a suburb of Warsaw, but I don't think they actually lie on the outskirts of the city any more. Maybe that's just me.
Not just you. It's spot on.
gs_sWhat sort of home are you looking for, cheap, mid-price etc, what's important to you in a district? Where are you from? Some people here might know both cities, and that can provide a point of reference.