I have blogged earlier about private walking tours of the city that I recommend and I would like to add another option... Free Tour Stockholm. As the name suggests, the tours are free of charge- though if you like the tour please tip your guide! The walking tour is 1½ hours long, guided in English and has gotten some great reviews recently. The guides are all passionate about Stockholm history and promise a fun & interesting tour. There is no need to make a reservation. You just show up at the appointed time to join the tour. The tours are run no matter the weather or amount of participants. The meeting place for the start of the tour is at the top of the big staircase at the square Sergels Torg. Click here for a map. Generally speaking, they offer 2-3 tours a week starting at 10am. Check their website, linked here and above, for actual dates and times.