I had the opportunity to stay at the Hilton Budapest during my trip. The location is great for tourists since it is right in the middle of the Castle Area (which has no castle) but does have amazing views of the Danube.
Getting there was easy enough since the confirmation stated to get on bus 16. Bus 16 is a tiny old rickety bus since it has to maneuver the winding roads up to the castle, but it runs regularly. The Hilton is right next to St. Matthias church so if you follow the numerous signs to the church you can’t miss the hotel.
Check in for executive floor eligible members is actually in the executive lounge. There is a sign stating this, but I attempted check in with the normal people first. The executive lounge has beer and soft drinks available as long as the lounge is open, but wine and liquor don’t come out until later. The fridge was stocked with plenty of Dreher and they brought out the Unicum in the evening for people wishing to sample the local flavor without wasting money. The Executive Lounge in Prague was much larger, but Budapest’s was never crowded at any time I went there.