Hermann is very nice and informative, has lots of maps in a book for you to use. He also had pamphlets for restaurants and other stuff.
Location: for the price, fairly great. It took about 12 mins. to walk to the U-Bahn/Metro, and then another 15 or so minutes with the actual metro to get to the city center.
House/Apartment: very modern, very clean. Has two couch beds that was comfortable for 2 people, but could easily fit 4 people. Lots of space, and a TV with cable (plus we used the HDMI from the box to stream Netflix onto the TV from my computer). WiFi is good, had no issues.
Kitchen: Has a microwave to use, along with a stove, refrigerator and freezer. There is no oven. Lots of plates, bowls, silverware (some were a bit dirty) and everything you need. No olive oil or cooking oil. Overall really great kitchen with eating area for 4.
Bathroom: Very modern and the shower was hi-tech. It felt like a really luxurious hotel! Only problem was that the water heater did not last a very long time, so we had to take quick showers. Could be a problem for 3-4 people, unless you take showers for a couple minutes each.
There was a washing machine for clothes and dishes (with detergent and soap provided).
Only cons: shower heater doesn't last long, and the pillows were a bit too big to be comfortable for me.
Overall, really enjoyed my stay there, and I would stay again!!