This is my metano.yml file after deleting the start_date line:

version: 2
send_anonymous_usage_stats: true
project_id: 0c4abadf-edd8-4b5a-9882-32e406804cab
plugins:
  extractors:
  - name: tap-spreadsheets-anywhere
    variant: ets
    pip_url: git+<https://github.com/ets/tap-spreadsheets-anywhere.git>
environments:
- name: dev
  config:
    plugins:
      extractors:
      - name: tap-spreadsheets-anywhere
        config:
          tables:
          - path: <https://datos.madrid.es/egob/catalogo/300497-11326516-distritos-municipales-madrid.csv>
          - name: distritos_madrid
          - format: csv
          - delimiter: detect
          - key_properties: []
          - pattern:
- name: test
- name: prod

First things that jumps to me is the structure of the table object. Should look like this I think

config:
          tables:
            - path: <https://datos.madrid.es/egob/catalogo/300497-11326516-distritos-municipales-madrid.csv>
              name: distritos_madrid
              format: csv
              delimiter: detect
              key_properties: []
              pattern:

so it's a single object and not many array elements

Oh! Thanks for the pointer. Let me check it out!