My two nights at montse's home in sitges were perfect!
Her husband and two kids are also very welcoming and helpful. They settled me in and then left me to do my own thing but always ready to answer questions and even share local knowledge about the city.
The guest room has a good collection of travel books to inspire you to think about other places you might want to visit.
The beach is an easy 7 minutes walk through some beautiful villas. The bus stop is very close by and a 5 minute ride can take you to the centre of the city where you can enjoy some churros or enjoy people watching while having a drink at one of the many bars.
The last bus (line 2)from the station to montse's home leaves at 08:56, so if planning to stay out later, then you can either walk back or take a taxi which will cost approx euro 8).
Overall a very good experience and if I go to sitges again, guess where I will be staying? - at montse's :)