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Hello, this is Jim and I am a dual-qualified lawyer (UK and Republic of Ireland) and happy to help you today.
By law, landlords must ensure the property is in good repair under S.11 of the Landlord and Tenant Act 1985.
If they do not, they face prosecution by the local council and can be fined. They also have to ensure your health and safety too. I recommend that you speak to the housing department at your council to ask them for their opinion on this - their email address is [email protected] and contact number 0121 303 5070.
In terms of the furniture being there and the issue with the keys, this may not be enough to say the landlord is in a major breach of the agreement sufficient for you to move out. They are however supposed to ensure your health and safety so like I say, if you speak to the housing department and ask them whether they agree that the landlord's conduct amounts to breach of contract. You refer to "other matters" so if you want me to refine the answer taking those in to account too then no problem, just let me know what you are referring to.
I hope this helps – if you can please give a positive rating by clicking 5 stars (at the top of your screen), I can answer any follow up questions at no extra charge and I will be credited for helping you today.