My daughter has been attending Gymboree Wimbledon for the last 6 or so months and my son attending Gymboree Putney for nearly 2 years before that. We have had great experiences at both. Most recently, I hosted my daughter's first birthday at Gymboree Wimbledon - the instructor (Sophia) was amazing. We had a mix of children between the 1 year mark and 3 year (mostly older siblings who came to) and she did a fantastic job of keeping all the kids excited. I love how the area is contained and it's great they have a place in the back for a party. There is actually more space than I thought. It felt a lot easier than I had in mind and I can only thank Sophia.