I have recently stayed there for 4 nights and did enjoy peacefull atmosphere, helpfull staff and specious bedrooms with really good quality beds. We have used advice given by a pal who few comments earlier posted timetables (cheers mate!!!) for local train service and had no issues to travel to and back from the city centre at all.
I would deffinitelly recommend however you have to be aware that hotel is in a purely suburban area.

Hotel is outside Budapest, direction Wien, in shopping zone . Hotel is near motorway, but quiet and is easy to access. Fenced parking with lots of space. Food in hotel is very good, so no need to go and look for restaurant. Staf is friendly, efficient and many languages speaking. Hotel may provide small accessories if forgoten, tooth brash, paste, razors.... Hotel is clean and rooms, despite with visibly old furniture are clean and spacious. Air con is noisy and mast to turn it off during the night.
WiFi is over charged!

The hotel is located outside of Budapest, nearby the highway.
Easy parking, nice rooms, good service, buffet breakfast.
Hotel also has some conference facilities.
They have a shuttle to the center.

We needed a hotel on the south side of Budapest, and the HI was located nicely in that part of town. Pros: Arrived, checked in seamlessly and was allowed into room early. Staff friendly and the parking is excellent. Close to some cute local restaurants in Budaors and a great shopping area nearby too. Overall,we would stay again. Cons: Its about 45mins in traffic to the airport, and the "Business Desk" was a laptop with a printer. (somewhat tacky actually, no scanner ability either).