We stayed at the Hotel Dellago shortly for only one night and were very happy with our choice. We had a quite reasonably priced room facing the street and with a shared balcony. The price is very fair compared to other equally equipped placed.
The breakfast buffet is great, the staff is friendly (however, not all staff speaks well English or German) and the food at the restaurant was amazing. Also the room was okay. Small as expected but with a comfortable mattress (for those who like hard mattresses) and especially, clean! Furthermore, the location with the view is amazing.
So for those looking for a place to stay with reasonable prices (compared to CH-standard) and a favor for design/nice atmosphere, I would recommend the Hotel Dellago!