Guy's place was amazing in terms of location and price. It was really awesome to be so close to Regent's Park and the underground stop (several of them!). Guy is amazing at communication, very prompt at responding.
This review will focus on pros and cons when you have small children.
Pros: elevator in the building! A separate bedroom. And a super flexible host who let us store luggage and then, when the reservation from prior night fell through, allowed us to check in early so that the kiddos could get some sleep after transatlantic flight! We really appreciated it! There is a washing machine which was huge plus. It was also mostly very quiet - one night there was some screaming and there is some understandable noise from neighbors but I think for such a central location this was amazing. There is also a playground right around the corner.
Cons: a bit small for two little kids crawling about. Maybe we just eat a lot but there are not enough dishes and utensils to account for the two kids. Also, only a limited number of sheets and towels are provided so I felt that with the two little ones we were constantly washing dishes and linen. (But there is a washing machine). It would have also been nice to have dishtowels, rags, paper towels and other means of cleaning up after ourselves (which we have to do a lot of course).
Overall, very pleasant stay but just be aware of these few details if traveling with kids. Thank you to Guy again for flexibility and great communication.