Aloe vera
Aloe stores water in its leaves and is happiest when the soil dries out completely between deep waterings. Mushy leaves are almost always a sign of too much water.
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Water when the soil reaches this point
How it shifts through the year
Every couple of weeks in a bright room is a common starting point, but check that the soil is fully dry first. In winter it may need water only once a month.
Overwatering is the usual cause. Let the soil dry fully, and cut away rotted tissue if the base is soft.
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Related guides
Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.