Great place to stay: really spacious apartment with fantastic views and good amenities.
Staying at the SkySuites made my (business) trip a lot more comfortable than a hotel stay, without making it more expensive - and the views over the city of The Hague are breathtaking. (A minor, but appreciated bonus: it was great to be able to open windows and get some fresh air all the way up there.)
Checking in was a breeze (I was even able to check in early, which was very handy). I didn't meet Elwin but he was very prompt at responding to my queries in the days leading to my trip.
In terms of location, the flat is within walking distance of both Den Haag HS station and the city centre. This isn't in the most bustling part of the city but it's handy.