We had a great time staying with Elaine. Her and her husband, Paulo, were friendly and caring hosts. Elaine speaks a fair bit of English (not fluent, but an enthusiastic learner) and so, with a bit of help from Google Translate, we were able to have some great conversations.
Elaine's house is located in a very busy area of Lisbon and with that comes both pros and cons. It's located centrally and so it's quite easy to get to public transport and to most tourist destinations. However, it's at the top of a lot of hills, so plan accordingly. In addition, the street is very busy and so, at night (and in the early morning), it can be very noisy (especially if you have the window open in summer to try and cool down the room). We used ear plugs (if you're a light sleeper, you might struggle without earplugs, but if you're a deep sleeper, it may not be an issue) but expect to be woken a few times each night. However, the house was quite cool even in the warmer weather.
Overall, we had a great stay and enjoyed spending time with Elaine and Paulo.