We had a great time in Munich. It's an amazing place it's very unfair describing Munich just because of October Fest, Munich is awesome, beutiful, full of historical places, gorgeous buildings, amazing parks and very friendly people.
The Nina's apartment location couldn't be better, there's a train station at walk distance and a metro at less than 400 meters. So you can buy a daily ticket, get the metro and being in any place easily.
The apartment is ok for two people with no special needs. All the amenities work perfectly, the shower, the calefaction, the kitchen, all work as spected, no problems at all.
The zone is quite and safe, and very close of a lot of bars and restaurants. As I mentiones before I can't image how the location could be better.
The public transport works perfect (it's a littel expensive) and can reach any place in Munich with it, but it's quite confusing to understand, there're a lot of ticket types, single, for groups, for one day, for tree, different zone, special tickets, etc. It would had been better if Nina had explainded what type was more convenient. I suggest you to download de DB app(the public transportation company) in your phone, it's easy to use and you can buy ticket from the app, so it will help you a lot. We didn't get any advice about transportation, markets, or turist places from Nina, it is not her obligation but we are use to get some from other hosts, so keep this in mind if you decide to book Nina's place.
The other weak aspect was the communication. We didn't meet Nina but her friend Niklas, a very friendly guy that gave us his phone number in case we need it. However we didn't know that Nina wouldn't be in the apartment unitil we arrive.
I strongly recomend Nina's place, just keep in mind the things I mentioned.