We thoroughly enjoyed our stay at Mette's beautiful apartment. It was walking distance to most places in Copenhagen and we liked being in Vesterbro too - lots of great boutiques and places to eat and drink nearby, including the 'trendy' meatpacking area. We didn't meet Mette in person (her sister kindly met us to hand over the keys), but she was really helpful & friendly from the moment we booked to checking out, including leaving lots of info on the area & allowing us to leave our suitcases in the apartment after checkout.
However one thing worth noting is that there isn't a lift in the building so, as the apartment's on the 4th floor, there's a lot of stairs! We didn't find them a problem, but worth knowing if you have mobility issues etc.
Also the end of Istedgade nearest the station isn't the most pleasant but we never felt unsafe. You could take an alternative route to the apartment if you really wanted to avoid it though.
We'd definitely stay here again if we were back in Copenhagen and would recommend a stay at Mette's to anyone (well, unless you don't like stairs!).