I've been getting a couple of PM's asking me where I stayed before my trip and if the Clink78 was a good place to stay beforehand.
I stayed at the Clink before my tour for about 4 days and had a twin room with a mate and then stayed there again for 3 days after my tour. It was pretty cheap compared to most of the other places we looked at and had everything we wanted. Our deal was like 45 pounds a night (which you obviously split between two) and included breakfast each morning. It suited us perfectly because we got to meet up with some of the people from our tour beforehand and it was close to the underground if we wanted to go anywhere. We were actually able to walk to a lot of places from the Clink as well so didn't always have to use public transport which was also handy.
I've had people telling me that they have heard that it's a dangerous area but I had no trouble at all. I wasn't roaming the street too much after midnight before my tour anyway because I was catching up on sleep from my flight and wanting to be well rested before my tour anyway.
I've also had questions about the noise levels of that place. You can get the occasional group of people coming home drunk but usually they move by pretty quickly and don't make that much noise. If you are in a dorm room you may get people coming and going at different times which is why we got the twin room.
My overall experience of the Clink was a very good one and would recommend it if you wanted to meet up with some people beforehand from your tour. It also helps staying there the night before you leave so you don't miss you departure time. Topdeck also put notices/news up in the lobby about the upcoming tours which is also handy.
The place also has a great computer room with a heap of computer and wifi which was handy. They have a big lounge, a bar downstairs if you don't want to head out around the town and it's good for having a drink and meeting people from tours just finishing and people about to leave on tours. There are washing machines and dryers which we used right before our tour. Once again for the price you are paying it's pretty good quality and don't expect the Hilton or anything like that. Each persons experience will probably be different but I would recommend staying there if it's only for 3-4 days.
If there are any other questions about the place just ask.