Torts — Landlord-tenant — Tenant’s action against landlord alleging negligence and negligent repair and seeking damages for injuries suffered by tenant when he slipped in apartment’s bathroom after water backed up in bathtub due to clogged drain — Trial court did not err in denying defendant landlord’s motion for directed verdict — Court did not err in denying defendant landlord’s motion for new trial which alleged that verdict for plaintiff was against manifest weight of evidence