I speak very little German so I didn't understand the description of the place, so maybe it was my fault I didn't realise that the apartment was in one of the worst neighbourhoods I saw in Munich (and we cycled around most of the city). But, as the friend Katharina (kindly) called in to translate during check-in, it's actually "not as bad as it looks" :-). And it's true that we had no practical/safety problems while there, except the distance to the Marienplatz town centre (neary 11 km by bike, all along cycle paths, and not the 6 km Katharina estimated).
Otherwise take the Ubahn (the station is 2 minutes away) but we got stuck buying tickets from the automatic machine (I couldn't work out which zones we needed - only zone 1 it turns out) and it's not the sort of place where you want to ask a passerby for help in the evening... So we skipped that.
The room itself is basic, but you can see that from the pictures; you get what you pay for is a fair assessment of Katharina's place, I'd say.
One thing I would have asked for if my German had been better: we'd have liked a sheet on the sofa bed! (she used a single duvet in its cover for us to sleep on - it didn't cover the bed and kept moving/wrinkling up).
But Katharina seemed nice and friendly so all in all it was a good stay.