The presence of green spaces in cities has been increasingduring recent years. The aim of this thesis is to understand the importance of these areas in the city through the ecosystem services approach, and to provide an example on how that approach is undertaken in two different European cities: Madrid and Stockholm. By using Geographic Information Systems, interviews with planning representatives in both countries, and planning documents, it was found that even though this approach is known and mentioned in both cases, the outcome in the distribution and accessibility of these areas varies widely from one study area to another.