As far as airport lounges, LuxxLounge is just meh. First of all, finding it was not so…read morestraight-forward, as you have to go near the airport entrance and upstairs. Therefore, if you use this lounge before catching a flight, give yourself plenty of time, as you will have to go through security again[1].
The layout of the lounge is also odd, as it develops length-wise, with the food/drinks area connecting two long rooms where tables and armchairs are located. Not all armchairs have access to a power outlet, and in fact there are extension cords in between armchairs, which I've never seen at an airport lounge. No TV's.
The bathroom has only 2 stalls and 1 sink.
Bottom line: if you have a long layover, then it's worth spending those few hours at this lounge; if not, then it's not worth it.
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[1] On top of Frankfurt airport being very big.