Paulo and Guido's apartment is a wonderful place to stay if you're visiting Berlin, it's in an ideal location, with a U-Bahn stop 200m down the road and tons of fantastic bars and restaurants in the area. As long as you're happy to climb 5 flights of stairs to the apartment you'll be rewarded with an incredibly warm welcome from your hosts and a fantastic room for your stay. I'd highly recommend this apartment and I'll certainly be going back when I next visit Berlin.