We stayed in the flat for 11 nights and thought it was very well-located and set up for our needs. We were travelling with a toddler and Mark had set up a brand new sofa, high chair and a cot for us. He also arranged for a neighbour with a minicab (and child car seat) to take us to Heathrow on our last day. Mark was very responsive, replying very quickly when we had queries. He also beought over extra toys and child-friendly crockery for our son. The flat is clean and has good natural light. It has a good washing machine, dryer and dishwasher and a great induction stove and oven.
Staying in the Brunswick Centre is also incredibly convenient if you need to pop out to get groceries late at night or for getting around London on the tube. There is good coffee nearby - you don't have to confine yourself to the Starbucks outlet in the Brunswick Centre.