The apartment is very nice and cozy with everything one might need. Plenty of natural light, nice decorations. We felt at home. The entrance in the building is on a main street which makes it safe to arrive at night. Very close to supermarkets, cafes and metro station. Within walking distance to all main tourist attractions. The only downside is that it is a rather noisy area during the night and early in the morning.
Helder was helpful and very flexible on check in and check out time.
I recommend this place and I would definitely stay here again.