This apartment is made so welcoming and comfortable by Peterson that I can't wait to go back. You're going to love Fine Buze, Universal and the Yoga studio within 3 minutes walk. Strong WiFi. Well equipped kitchen.
If you arrive by metro (which I recommend) you will get off at the Carolina Michaelis station. Be aware that you will need to walk downhill through a municipal garden that has several long flights of stairs. At the first road you go left. Number 78 is posted on the wall near the street but you will not see it unless you turn and look back. Go up the stairs, find door labelled 78 and buzzed in. Elevator to the fourth floor and you're home!!
Metro cards work for the bus system also. You can easily recharge them ... Just place it in the holder on the ticket machine at the metro station and follow the instructions on the screen for recarga.
The little stone church just down the hill is probably the oldest church in Europe. Be sure to walk around the building. It's cool.
Seven bridges boat tour is excellent ( maybe six bridges .. I forget).