Muhammed's place is a real gem.
Location is perfect with most places that you'd wish to see easily walkable, and lots of great eating options in the nachtmarkt right outside. For Asian food lovers there are several options close by along the same road or the Vietnamese and sushi place in the markt is also very good.
We also loved the banh mi at Banh Mi Street Food (7 mins walk), sadly only found on our last day.
There is a an amazing supermarket underneath the building and good coffee places within 10 mins walk - we'd recommend Coffee Junkee or Carl Ludwig. (be aware though that good coffee and good breakfast or good cakes are not easy to find in the same place so we went for coffee then ate elsewhere...)
The apartment itself is almost perfect...spotlessly clean, well furnished and comfortable, even the shower pressure is fairly good.
Although centrally located it is not noisy as the windows are triple glazed but also can be opened.
Only downside is not enough pillows!