Josefina's apartment is compact but has everything you need in it - kitchen with stove, fridge, toaster, kettle, bathroom, TV and DVD, internet and wifi (thanks for setting that up for us!) sitting area and outdoor looking over the street, storage space if you're staying a while. There's also close access to supermarkets. There's a lift up to the apartment if you have big bags.
We didn't meet Josefina but her mum was very attentive and checked on us a few times during our stay to make sure we were ok. She also left a range of tourist information which was interesting reading.
We walked to nearly all the tourist sites from there (20min or so, plenty to look at en route), or took the subway which is very close. There are a number of local restaurants on the street or otherwise the pedestrian malls with food and shops is only a block or so away
It does get a fair bit of car noise in the mornings but I'm also not used to big cities