We had a great time at Alex's. For us, it was very well situated, there are always buses to go the nearest train station (Pasing), even on week-ends. Then it's only a 20 minutes ride to Marienplatz. The instruction to get there are clear and simple. And in any case, Alex responds quickly if you find you need some help.
The place was big, and we were seven! The area is really calm, so if you need someplace not to far from the center, go for it.
Just keep in mind that there may not be showel gel or toothpaste (there wasn't when we arrived), as well as pepper or oil in the kitchen, but there are a lot of shop around the train station, where you can get anything you need. The kitchen is really functional, we could easily cook for seven people.
Will definitely keep this place in mind if we come back next year!