We stayed in June just before the walking season began. The apartment and Radstadt is perfectly set for exploring this region.
Well maintained, well equipped apartment block we made use of the facilities provided including the sauna which was very pleasant after very long walks. The manager of the block was incredibly helpful in helping us plan our stay.
A visit to the Rossbrand peak the mountain of Radstadt is highly recommended especially at sunset!

We stayed in the Amadeus apartments for a fortnight in June 2016. The apartment was ideal for us and included excellent free WiFi.
There was also a sauna that provided a nice way to finish long days out in the mountains.
The pool in front of the apartments is the community pool for Radstadt and not owned by the neighbouring Sporthotel. It is a pity that the hotel makes it difficult to access the pool from their car park.
Housekeeping is very good and they can do your washing for you by arrangement (at a cost of 7,40 euros).
Car parking is available in allocated spaces undercover.
The views from the apartment are wonderful - see my two photos.

We rented a studio apartment for two weeks. The drive ways to both houses are very steep and although we had covered car parking it was very tight with a large car and dependent upon the person you are sharing your section with being a competent driver. Much easier to reverse into although the bay window on the house made this difficult with a long estate car.
We were later arriving then planned due to major road works on route. We followed instructions and phone the manager Connie who informed us of our apartment in house 2 and that being Saturday meant check in would be Monday.
The apartment was very much as expected but did include hairdryer, hair and body wash etc as well as plenty of toilet paper. There was also a small bottle of wine and coffee and filters to get you going.
The apartment was extremely clean but there was a problem with the was basin plug being broken which meant you couldn't fill the washbasin. This was reported but nothing was done. The bed was very creaky and if you are allergic to feather pillows then I advise you bring your own.
We had a very large balcony with an exceptional view of Radstadt as well as the swimming pools which actually belong to Radstadt (you get a free entry card from Connie) but be aware they get very busy in the hot weather as well as noisy.
Due to the seating arrangement in the studio the tv was on the wall above the very comfy sofa so you had to sit on the dining chairs or in the bed. This meant you banged your head on the wall/reading light above the bed which we not really in the right space.
Connie has an agreement with the nearby Grundlers hotel for a half board. Thus wasn't available the first week we were there but did go on the plan for our second week. This gives you a fantastic Buffet breakfast and a wonderful evening meal. It did state on the information that if you booked and paid for a week then you got use of their spa and indoor swimming pool but this was never offered to us.
If you are looking for a base to explore then this is the ideal place. If we were to stay again I would definitely pay the extra cost for a one bedroom apartment.