Stayed here for 3 nights in Dec 2012 and couldnt fault it. The room was clean and comfortable. I agree it was a little too warm on one night and you are not able to turn down the heat so just had to open the window.
Its a few mins walk from the railway station and about 10 mins to the start of the main Christmas markets. Tram stop is just round the corner for easy access to all of Munich.
Staff were very helpful at all times and the breakfast was great - lots of cereals, juices, tea and coffee, breads, pastries, eggs, bacon and sausages. It is 12 Euros but well worth it.
Would definitely recommend this Hotel!