Haus Wartenberg is a small family hotel conveniently close to several bus routes into Salzburg (10,1, 22, 21), and you can walk there through the tunnel (about half an hour). We were offered an apartment nearby, which was very spacious although it was not serviced daily, lacked wifi (European 3G roaming is still possible of course), and had a capricious shower; this was more of an AirBnB from a friend than an apartment owned by the hotel, but they managed everything. Overall we're happy we took it and the access with heavy cases was easy. Their restaurant has a good menu, and breakfast is a normal buffet. Parking is anywhere that can be found on the street, and because this is a 3 hour limit area the staff take your keys and periodically change your disc for you, which seems to be legal (!). They sell the Salzburg card, which is great value. Reception is not always staffed, but you can usually find someone. There was some confusion on check out as to whether we had paid or not, which was resolved after a few minutes. Overall the location was good, the staff were friendly and helpful, and the price was good for being so close to the centre.