My friend and myself stayed at Dzark's for a weekend. It is a good option if you are arriving late as it is self check in. It is not in city. You need to take the bus every day (2£ per trip) which passes every 10 mins and you are there in 15.
The place is an old house turned into different rooms for bnb so you can be sharing with another people and sometimes bathroom can get busy.
we didn't use the kichen because it was dirty and didn't feel comfortable using common stuff, but the room is very nice and clean.
It is a good option if you are looking to save some money.