Peter waited for us in the flat as per the times communicated and gave us a little tour around it and gave us a few tips on where to buy food etc (many thanks Peter). The flat has got everything you need in order to feel like at home. While the décor is slightly outdated (which some people may mind though that is not a problem for me), the flat is very clean and cosy in comparison to a lot of hotel rooms I have been to. I definitely did not hear any extra levels of traffic noise from the streets which some people mentioned on their posts even when I opened the window (maybe it helps that the flat is on the 6th floor)
The flat is within a walkable distance to the centre (about 30 mins for those who like walking). The U-bahn (Pilgrimgasse) is about 5 mins walk which will take you to the centre within 10-15 mins. All major sightseeing spots are within easy reach. Worth going to see Naschmarkt (about 10 mins walk, or take U-Bahn to Karlsplatz) which offers variety of different foods across the globe.
If you plan to visit Schonbrunn, you may like to pre-book a ticket or you may not be able to get inside. We were quite surprised to see the number of visitors pouring in to see the place famous for Sissi and hence ended up visiting the gardens only. They were spectacular though I would recommend to visit them in spring, early summer to see it in full glory
The biggest surprise was the ice-rink in front of the Rathaus which we all enjoyed and would fully recommend to everyone though worth bringing your own skates as those you can borrow are not the most comfortable things you may opt to put on your feet :-)