I was attending an event in Bratislava and chose this place. The location is nice, the centre and hrad are pretty close, lots of buses too. disappointingly i couldn't figure out how to take a bus from Novy Most/SNP bridge. My main complaint is that the air conditioner caused me some common cold symptoms, and there was no way to switch it off once and for all (especially overnight). I have to say that it was pretty hot outside, about +30. One of my main reasons to choose this place is the wellness area. Honestly it's not very well-planned but the saunas are great. The massage shower in the dressing room is really nice too.
I actually went to another hotel's spa centre twice, 20 min away by tram. Definitely liked it more, but I don't regret having stayed at Falkensteiner.
The spa is open until 11pm and that's great, though on two occasions i couldn't get in around 22.45. Disappointing after a tiring day. On my departure day I also couldn't get in at 11.30 although half an hour is plenty of time for some relaxation in the sauna.