It depends what you mean by 'Executive lounge'. If it is business facilities that you mean (meeting room, fax, etc) then this is not readily evident to tourist travellers. I would suggest you give them a quick call and ask. Thank you.
Sorry don't know the answer to that
Sorry I don't know. Drop them an e-mail.
No idea if there is an executive lounge.
Get an answer from Radisson Blu Sobieski Hotel Warsaw staff and past guests.