There are 4 zones for street parking in Reykjavik labeled P1, P2, P3 and P4. Each zone is marked with a sign, usually attatched to a lamp post or payment machine. P1 is the most expensive and is mostly located downtown near Laugavegur .
Right in front of Sif Apartment we have P2 which is charged on weekdays between 9.00 – 18.00 and free overnight and on Sunday. There is also a P3 zone about 3 minutes walk away, which is little cheaper (see map). You can pay either using the app or Payment machines (See below)
On this map you can see the street parking locations around Sif Apartments and the charges. Uncoloured areas represent free parking, given they are not privately owned.