Location:: It's about 10 min walking from May's house to Neasden station, where you can easily go to Baker Street and change to any other line for tourism purposes.
Bedroom: It's more than enough and indeed clean. There's a heater too that is scheduled to warm periodically. In fact, it's more than enough for a few days.
Kitchen:: Depending on your luck you may get great people sharing other bedrooms available, so you will end up having a well equipped kitchen to use, however if you get unlucky due to one noisy 'neighbor' you may get stressed.
General:: I'd personally say that May is very kind and tries to respond as quickly as possible, so you may get well covered here. House itself it's clean enough for a good staying, but everything may change depending on noisy neighbor as I had wonderful days there but the last 2 ones. If you're looking for a cheap place, well located and worried about privacy (everyone has their own keys), that's your place.