me and my wife, recommend me should I go for 1 bedroom or 2 bedroom apartment?
Apartments in Poland don't count bedrooms, they count rooms. A two room apartment is the equivalent of a one-bedroom apartment. They usually have a kitchen and bath (maybe separate WC and bath room) and usually have a entranceway (the door to the apartment usually goes into a little room with closets and not into the living room).
- As an Indian, I would like to stay at a place where most of the Indians are living.
Polish infrastructure (and a decades long housing shortage after WWII) means that ethnic ghettos don't really happen.
possible close to park, restaurants, pubs, tram/bus station.
public transport should not be a problem, it's pretty efficient and widespread (local people complain about it but they're wrong) Pubs aren't really traditionally a Polish thing so you'll only find that kind of thing in the center of the city.
reason I was looking at a place where Indians stay is because I cannot speak polish, so socializing with poles would be a bit difficult
Then learn Polish, most Polish people are not anxious to socialize in English (esp Indian English which is perceived as essentially incomprehensible). Polish is the language of basically everything and the more you know the better.