So the good points first: fully automated check-in meant easy access from noon and a noon check-out too. There's a 24hr shop near the garage next door and there's also a couple of budget restaurants and a supermarket very nearby. The hotel is within walking distance of the Altstadt (about 15 mins) and a cheap (7 EUR) taxi ride from the Hbf or a few mins by tram and less than 10min walk. The room was very clean and the hotel looks new. Breakfast - not a huge range of choice but what was there was fine and not too bad for 6 EUR.
On the down side, the bed wasn't hugely comfortable - although it was supposed to be a double it was two single mattresses stuck on a kind of shelf, and I didn't sleep all that well. And it was quite noisy - footsteps on the corridor outside were loud, and the loading into the garage outside early in the morning was also loud enough to disturb sleep.
You can't fault the price having said all of that, and it was fine for a quick stopover in Augsburg.