Just to give another insight...

We went a few months ago to Hilton Belfast. One night P&C, the other was a Visa Free Night Cert - so both nights we booked a normal standard room.

When we arrived, they had upgraded us to an executive KING STUDIO ROOM, which I think is one of the best room types in the hotel? Floor to ceiling windows... it was great.

Lounge was a good experience, with nice staff. Very busy though.