We stayed in the Platzl in March 2007. Absolutely splendid hotel! I posted a review and several pictures on tripadvisor. It was located around the MarienPlatz and close to the Viktualienmarkt. The Hofbrauhaus was at the back of the hotel as was the Hard Rock Cafe. I think this must be where the noisier cheaper Platzl rooms are located. The breakfast buffet was fit for a king and was the largest spread of top-notch breakfast foods I have ever seen. Fantastic location and nice people at the front desk. The hotel has been refurbished recently.
We booked the hotel through a German travel website and got a much better rate than through the hotel
directly.
http://www.hotelkatalog24.de/
Unfortunately the website is in German and I don't do very well at all in any language other than English. However, I emailed the people at Hotelkatalog24, told them of my language barrier and they cheerfully did all of the booking for me via email and fax. Great people to deal with.