If the original lease has restrictions on how many times a week or a month you could have overnight guests, that is part of the terms of your month to month tenancy.
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Landlord may make guest restrictions to prevent guest from becoming full-time residents but if the restrictions cannot be so invasive that they infringe on your privacy rights. 2-3 times a week is not a full-time resident.
-Michael R. Juarez Law Office of Juarez and Schaeffer PO Box 16216 San Diego, CA 92105 (619) 804-4327 www.jslaw.org Mike@jslaw.org This posting is provided for “information purposes” only and should not be relied upon as "legal advice." Nothing transmitted from this posting constitutes the establishment of an attorney-client relationship. Applicability of the legal principles discussed here may differ substantially in individual situations or in different jurisdictions.