We stayed at Monica's during our visit to Oktoberfest and for that time of year I would say it was excellent value. The location was also great for that purpose. It was easy to reach the fair grounds without being too close so it was never noisy with drunk revellers at night time - in fact it was very quiet every night. It is also well located for reaching Munich's other sights including the museums, the English gardens and the centre of the city.
There were three of us staying in the room and both the double bed and single were large enough for the purpose and we never felt too cramped in the room together. Monica's apartment was also very clean.
Although Monica was away when we arrived she kept in contact and had someone waiting to let us in on our arrival. She always replied to any messages we sent in a timely fashion.
We would recommend Monica's place, particularly for a visit to Oktoberfest!