Google Hilton Gdansk with results as Images, and you will see plenty of photos, interior and exterior, to begin to give you an idea. The hotel is situated on the banks of the Motlawa river, and it seems situated well for easy walking. Lech Walensa airport in Robiechowo is 9 miles away, the hotel pages (which are somewhat instructive) say PLN 80 - 150 (depending on taxi or limo) and PLN 1 for bus. It does not appear to have a lounge.
Less than 1 mile from RR station, see Google Maps
here.