I live with DP in a 3 bed flat which he owns. We have 2 housemates, 1 in each of the two other bedrooms. We're both getting pretty fed up of them. One housemate is Russian and speaks terrible English which makes raising any problems difficult. She's also quite timid and shy so difficult to be direct with. For the last couple of nights I had terrible night sweats which I put down to my cold, but I've just realised the thermostat was turned up to 20 degrees! Our flat is modern and very warm so there's no need for the heating to be on at the moment, nevermind at 20 degrees.
Our Russian housemate takes 90 minute baths most days so we're having problems with mould from all the steam. Not once in 4 months has she cleaned the bathroom. I did it every week, but for the past 6 weeks I've stopped cleaning it thinking she would - but she hasn't. The other housemate is a little better with cleaning, but they both treat the house like a hostel, in which they are responsible for their room but not for any other aspect of the house.
We have an old fashioned tumble drier which creates a lot of steam and is very expensive to run. The 2 housemates have been using the drier for a few hours a week each despite it being just as quick to dry things outside at the moment. I mentioned this to our other housemate, and the next morning I came downstairs to find a load in the tumble dryer and a house full of steam.
DP is reluctant to say anything because as a resident landlord he doesn't want to make things difficult. Also, the situation has gone on for so long that I'm unsure about what to do. Both housemates are due to leave in September so I'm tempted to just leave things as they are. Am I being unreasonable to be fed up - they're fairly minor issues in the scheme of things - or should I try and do something?