Melanie's place was great for us. We have a 2 year-old and Melanie provided a high chair, toddler bed, and toys for her. It also has a washer which is a big help with a little kid. There was some door slamming and banging from the upstairs neighbors during nap/bed times, but they have kids of their own and a different schedule than we are used to at home. I don't think there's much that could be done.
The location was excellent, very convenient to the city center and transportation options (bus, tram, and subway), as well as cafes, bars, and restaurants. We really enjoyed the easy access to many parks with playgrounds and kid stuff, especially the Jardi Turia only a few blocks away.
Melanie was really helpful when we had questions about the washer and also when we locked the keys inside the apartment. Her husband was there half an hour later to let us in! It definitely felt like we had all the support we needed to have a comfortable and enjoyable stay.