We had a very good stay, the apartment was clean and the stay went smooth.
Price-quality a good deal and close to the metro so you can easily get around. Also the close-by neighbourhood is nice to walk through a bit.
The only problem was with the check-in/check-out. The Keynest location was incorrect so we had to go to a new place to collect the keys (which also lead to confusion and unclear instructions for check-out). The locations and the apartment were about ~5min-10min from each other so no huge deal, but a bit stupid.