Stayed here 2 years ago and gave it 8/10. The property has dilapidated a lot since, particularly the corridors and stair cases.
The worst things about our stay was the state of the en suit bathroom, which was absolutely filthy. The toilet rim was covered with a black substance so had to clean it ourselves - no idea what it was (the pic was after flushing twice). And the toilet seat was loose. Hairs were everywhere and the shower cubicle hadn't been cleaned for a long while so wasn't used. And the fan on show wasn't working, luckily we brought our own as there was a heatwave occurring.
The good bits - the lady in reception when we arrived was nice and friendly. The sink, fridge and microwave were acceptable, but for me the best thing about the apartment were the beds - very comfortable making for a good night's sleep.
Also the location is ideal for exploring Southport's town centre, amusements, cafes, bars, shops and Prom.