Sofia de Roa, 28, was one of the first to take part in the demonstrations, which she says were a political awakening for the Spanish people.
"Citizens were not used to speaking out on political issues. My parents never discussed politics with me, but now that is changing. The movement awoke a lot of people who were not interested in politics before."
Scherma agrees: "The 15-M movement made people talk about social issues, and about politics in normal conversations -- in cafes, restaurants, bars -- where before they only talked about football or fashion."
Nowadays, Madrid is a city of protests -- it is almost impossible to cross the capital without coming across a sit-in or a march, petitions are everywhere, and the activists have returned to the Puerta del Sol.
The demonstrations are organized through the internet, particicularly Twitter and Facebook.
"We use the social networks to communicate," explains de Roa, brandishing her smartphone. "This is the tool that has permitted us to fight together, and to feel that we are not alone."
Their subjects are anything and everything -- from education reform to job losses, government cuts to corruption -- but all reflecting a widespread dissatisfaction with politicians and their handling of the country's economic crisis.
"They are destroying our future," says college student Alejandra, as she participates in a march in support of public education. "We know there's a crisis, but it could be less if they managed the money better.
"All the political parties do is accuse each other, the government is destroying the country, and the conditions for workers are getting worse and worse."
Each protest is color-coded: White for healthcare workers, green for the education sector, orange for social services, red for general trade union members, and black for public service workers.
On Saturday, February 23, all these individual groups are expected to unite for rainbow-hued mass demonstrations in towns and cities across Spain, known as the "Marea Cuidadana" (Tide of Citizens).
Back in Vicalvaro, the moment of truth has arrived, but the crowd -- now shouting at the police, insisting they should be ashamed of themselves for helping to evict families -- appears to have had an impact. Rocio is summoned downstairs, as lawyers from the PAH explain that she will be able to stay -- for a while at least.
For those working to stop Spain's eviction epidemic, today has seen a small and temporary victory: The bailiffs have been put off for now, but Rocio knows they may yet return.
For those demonstrating about cuts, corruption and a lack of cash, the protests will go on.