Salaams
Re the mouse - you can call Pest Control at your Council and they will come and get rid of the problem for free for you....I suggest you do it ASAP the mouse has prob come in the house as its warm, to make a nest, in which case you will have more than one soon! and they breed very fast with each pregnancy only lasting 6 weeks and producing more than one baby - I know all this cos I lived in a horrible student house that ended up over-run with mice due to my dirty housemates phobia of doing the washing up!
Re the mould on the walls - this is a health hazard and the landlord has an obligation to maintain the house for you in a liveable state that does not damage your health, by law. He can be fined heavily if he doesn't by a court. If he refuses to sort it out then speak to Citizens Advice bureau...or just say you will not pay the rent until he sorts it out - this usually makes them start doing something about it pretty fast! Failing that another option is to just move out with no notice to him and dont look back! By refusing to maintain the house in a liveable state for you he has broken any contract you had..
If the mould is very bad dont sleep in the room where it is unless you have to and dont let anyone with asthma or breahting problems or old people or young children sleep in there....my husband's room in his student house had damp...when he caught regular flu it turned into a severe chest infection that lasted 2 months because of the damp in his room and his snooker cue warped in the damp....
i hope this helps insha'allah....firstly call the Council re the mouse problem and then hassle the landlord...
good luck insha'allah....because you went on holiday has absolutely no bearing on whether its your fault or the landlords - you can sort the mouse out, he HAS to sort the damp out for you.
Wasalaams
