BTW there are two 4Points ( Central and Olympiapark ) both without lounge. The LM is quite central and nearer / closer than the 4Points Central to the city, but no lounge.
The sheraton Westpark is directly over a U - Bahn stop. Lounge ( nothing to write home about ) is open every day and there is a little pool / spa.
The sheraton Arabellapark has a lounge, which is not open all the time on weekends, a pool ( also public for the neighbors ) with view over munich ( top floor ) and is near to public traffic.
The sheraton Grand has the best sheraton lounge in munich, a pool / spa and is also near to the public traffic.