I've just spent 2 weeks in Den's apartment and had a great time. Communication was great at all times and check in easy. The location was perfect, I usually stay in Thisseo when in Athens so know the area well, and it is definitely the best place to stay, really cute neighbourhood, close to the centre and also Gazi for nightlife. The apartment was as described, and perfectly fine for 2 weeks - the Aircon was a god send in the Athens heat! I was remote working and the Internet worked fine throughout my stay, and the TV came with Netflix.
If I had to offer some suggestions for improvement, it would have been nice if there had been some basic cooking ingredients in (e.g. oil, salt & pepper), the shower head is a bit temperamental and the mattress was a little bit soft for my liking, but that is personal preference and these are only small things. I'd definitely recommend the apartment and I'd happily stay there again.