I enjoyed staying at Roombach hotel.
I stayed over two nights and this was the 4th trip to Budapest (two biz, two private)
+ Service : 5
+ Facilities : 3-4 (No mini bar/water/tea...)
+ Cleanness : 5
+ Location : 5
+ Bed comfort : 3-4
If the comfort of bed is the most important, Corinthia will be better choice.
If you are not too sensitive for that and you prefer better location for party, I strongly recommend this hotel.
Overall, I rate more than 4 out of 5.