Our family (ourselves and two daughters aged 12 & 10) spent 10 days here in Apr 2019. Positives: (a) great location; a lively section of Mayfair only 5min walk from Green Park tube station and close to a wide range of pubs, restaurants, amenities; (b) bibliophiles will love the host's eclectic range of books; (c) the little roof terrace has nice view over the Victorian rooftops; (d) the king-size bed in the master bedroom is very comfortable and (e) the hot-water worked fine for four people. But, sadly, that's where the positives end. The place (small to begin with) is very cluttered with the host's belongings making the place rather claustrophobic. Also, the lack of open-able windows meant (even in the mildly warm weather this Easter) the place got hot and stuffy. Further, the place was in need of a deep clean and (judging from the traps in every room) has a rodent problem. There was a lack of basic amenities (we could find only 3 towels [only barely usable] and one tea towel; there was a bare minimum of crockery and cooking utensils). In summary, you will need to have some resilience and a sense of humour to enjoy this property.
H