Sebastian's place is an average choice for budget oriented / short stay backpackers.
Location is okay, near the market and in the Roma area.
The room is small, with old furnitures and worn out paint. It has little light and the only window opens on the kitchen and cannot be completely covered.
I never met Sebastian in person, her roommate gave me an express tour of the place and that was about it.
Sebastian was reactive and helpful on WhatsApp during check in though.
I later changed for a hostel in the very center which was better for a cheaper price.
Overall average experience, even for the price.