We had a very pleasant stay at Nick's place. We were four grown-ups, and there was plenty of space for all of us. The apartment has what you need, and is located in a nice area. You can walk to Naschmarkt, and also into central Vienna. If not up for walking the couple of kilometers, then public transportation is very close and easy to use.
Though we did not meet Nick, he was very helpful, and it was easy to pick-up/deliver the keys. Try the Budapest Bistro below for a nice breakfast or a light lunch.