I don't see why that would be an immoral restriction.

I don't think it's a reasonable restriction, but unreasonableness doesn't make it immoral. At the same time, if you make an agreement not to program in a rental and then you program, shouldn't you need to stop or leave? I might have moral concerns about how one enforces a restriction against programming, it's probably intrusive

Now, if your question is no programmers and/or no overnight guests who are programmers and/or you can have six tenants in the unit, but no more than three who are unmaried programmers... Then my moral compass is pointing towards no. Restricting the practicing of a profession on premesis seems fine, descriminating against the practitioners is ick.

Pets, and car maintenance can both damage the property. Noise in the quiet time disrupts other tenants

Does programming cause property damage or impact other tenants?