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Two apartments/same building in Lisbon

Traveling with my mom, aunt, husband and daughter over Christmas with a home base of Lisbon. They (mom and aunt) aren't interested in moving locations, so will likely do day trips (or, my little family will split off for a few days).
We'd love 2 apartments in the same building for more space. Airbnb/VRBO doesn't seem to let me sort this way. Any recs or ideas for such a place? As always, thanks in advance.