I just got back from London last night with me 2 teen age kids.
we stayed at this great apartment and had a wonderful time.
the location is great - right next to a train station (you can hear it at night but very weak and wont disturb your peace or sleep), its a good line and very useful.
right across from the apartment is a sweet park - queens park, fun to walk in the morning and visit the squirrels.
main street just 3-4 minutes away with a great access to coffee shops, 2 supermarkets, Starbucks, and restaurants, the building is small, we only saw the neighbor's on the last day, didn't hear them at all.
pointers:
1. the sofa bed in the second bedroom was not comfortable, but the bed in the main room was perfect.
2. there are a lot of stairs, also in the apartment it self (to the kitchen and living room), so make sure you are fit :)
3. we didn't have hot water when we arrived and it took a bit too long to be fixed, but once it was fixed, it was great, wonderful bath...
4. kitchen is fully supplied, you can cook and eat in, and do your laundry, so you don't have to bring a lot with you.
5. the keynest for your check in is right around the corner, don't be alarmed (it wasn't clear to us, and we needed help from a street walker).
6. if you are not British - bring your own electricity adapter!!!
we will for sure come back.