Just "Go for it!"
The check-in is really easy anytime. We spent 4 nights in the studio 7 and it was perfect and really nice.
first the studio look exactly like the pictures. It was great for two people and the balcony is lovely for a cup of coffee in the morning under the sunshine.
You just share the bathroom and toilets (separated) with an other room so it´s really not a problem.
The street is really quiet ans the close neighbourhood is really nice and convenient: you have sainsburry (a huge one) and victoria tube and train station at a few minutes walks.
I highly recommend it and I would come back for sure!