We picked Juan's place as it is around the corner from where my brother lives in Madrid and it was a perfect location in that respect. You have a view of the palace and the park and you can easily get to the centre by walking up the hill. The downside is that Calla de Segovia is quite a main road so it took us the first night to get used to the traffic noise (but we live in the country so are used to no noise at all!). It's a great place to use as a bedroom while you are visiting Madrid but the living space is not very cosy and the kitchen and bathroom are really small so it wouldn't be somewhere you'd want to spend a lot of time hanging out.