We stayed in a first floor apartment, and the experience was very good. You get a single access code that gets you past all the various gates and doors into your flat. Be warned; there is no lift.
Inside, furnishings were neutral and stylish. The sofa was comfortable. The kitchen was equipped with kettle, large saucepans, knives, scissors and usual crockery/cutlery. Smaller plates and glasses would have been helpful. There is no toaster or microwave, but there was a coffee maker, with pods supplied, which was thoughtful.
There was a useful table - although you have to watch the low-hanging light above it. My husband found the wooden chairs a bit hard to sit on, but there was a comfortable chair in the bedroom.
Be warned - there is very little space for storing your clothes. One thin cupboard will fit a few things on hangers; with one shelf above. No drawers or dressing table, so you will need to live out of your suitcase. One oddity; despite there being a double bed, you are given two single duvet covers for it.
The location is fantastic; Nørreport station/metro is a short walk away and links you to everywhere you might need to get to. There's a supermarket round the corner (and if that doesn't have what you want, two more a short walk away, along with a couple of bakeries). No problem finding somewhere to eat out; there's lots of options. Despite being so central, the apartment was pretty quiet. Very easy checking out at the end of our stay.