Ok thanks, i thought this was the case!

Hi All, I hope you can help me, as I need some advice and have seen that this place seems like a good place to start. This is the first time i have rented a property, and it is doing my nut in. So much so that i can't stand to be here. I moved into a studio in mid october last year, having been told by the letting agent that there would be a washing machine installed in the premisis ASAP, which i was ok with. I figured it would be ok to go to the laundrette for a week or two. Now it's january, still no washing machine. And this isn't even a big issue for me... The manager of the property (i have never even seen the landlord, he doesn't speak english so has someone manage the property for him) is slow as hell about doing anything. The property was meant to have internet access for all studios, but there was none for about a month and a half, and that was because i inquired about it once a week, and even had to set it up for the manager and buy a router on his behalf. Still, this is not a big deal for me. When the shower was causing a leak through to poor installation, i had the tiling taken out so that the pipes could be inspected, this was done while i was out (with my permission). Upon returning home the tiling was still in a heap in the bathroom, with a huge mess in the shower. I can live with that oversight. (i couldn't use the shower in my studio for over a week and a half, waiting for it to be repaired). But since before Christmas, i have been unable to contact the manager. He said he lost his phone, but I could contact him through another tenant. I was told I could report all faults/repairs that are needed to be made to the manager, but that's no good when he has been awol for approaching a month now. This other tenant also wanted to contact him but couldn't, and found out two days ago the manager is out of the country. Since before christmas I have had a toilet which won't flush properly, the bathroom light doesn't work and the extractor above the hob works every other day. The light and the extractor are barely a blip on my radar compared to the toilet. I'm sure i don't have to spell out what a huge inconvenience it is having a toilet which doesn't flush during this season (i have had various illness's through december and new year, at the moment it's winter vomiting bug thats going around). I honestly think all the hassle and stress is bad for me, and I now want to return to live with my parents... I want to know what my options are. It was a 6 month agreement, when can i give my notice? Can the fact that the property has had these problems (and no repair) mean i can give notice sooner? Also, when i first got the property i enquired about breaking the agreement early (there was the possibility i might need to leave the country on work), and was told that would be fine as long as I found another tenant to replace me. The manager is actually a nice guy and we get on quite well, so I think doing this might be my best option. Do you agree with me? Any thoughts and/or advice would be appreciated.