Use when the user compares places by what they can afford ("2-bed flats
up to 300k in Porto or Valencia", "and with parking?"). For each place it
counts the cohort (type, sale, bedrooms), the part within `max_price`,
and, with `has_parking`, the part within budget whose listing mentions
parking. `share_pct` is that part over the place's priced cohort.

Relay the SHARES, not the counts: counts reflect how many listings Cubi
holds for each place, not the size of the market. These are asking
prices of active listings, not sale prices or valuations; say so. A
place is counted at the level in `level` (a city when the name has a city
reading). Never compute or invent a figure that is not in the result.

Args:
    places: 2-3 town or city names, e.g. ["Porto", "Valencia"].
    type: property types, e.g. ["apartment"].
    transaction_type: "sale" (default). Rental budgets are not supported.
    min_bedrooms / max_bedrooms: bedroom bounds (equal for "exactly 2").
    max_price: asking-price cap in EUR.
    has_parking: also count the budget cohort with parking mentioned.
    lang: ISO 639-1 code for the sample listings (en/pt/es/fr/de/nl/ru).

Returns:
    JSON: places[{place, level, base, within_budget, with_parking, listings}],
    each cohort {count, priced, on_request, share_pct}; `listings` are up
    to 3 homes from the last cohort counted, for "show me those".